Getting Started documentation update.

* Put Core Build and Managed Build items in separate topics.
* Added two images to Creating a CMake project.
* Added new pages about creating a CBS Makefile project, using
  existing code, and the launch bar.
* Renamed "Creating a simple application" to "Creating a Managed Build
  System Makefile project" and replaced two images.
* Removed "Creating a Makefile project", because it was duplicate
  information.

Fixes eclipse-cdt#992

doc/org.eclipse.cdt.doc.user/src/getting_started/cbs_launchbar.adoc

@@ -0,0 +1,52 @@
+////
+Copyright (c) 2000, 2025 Contributors to the Eclipse Foundation
+This program and the accompanying materials
+are made available under the terms of the Eclipse Public License 2.0
+which accompanies this distribution, and is available at
+https://www.eclipse.org/legal/epl-2.0/
+
+SPDX-License-Identifier: EPL-2.0
+////
+
+// pull in shared headers, footers, etc
+:docinfo: shared
+
+// support image rendering and table of contents within GitHub
+ifdef::env-github[]
+:imagesdir: ../../images
+:toc:
+:toc-placement!:
+endif::[]
+
+// enable support for button, menu and keyboard macros
+:experimental:
+
+// Until ENDOFHEADER the content must match adoc-headers.txt for consistency,
+// this is checked by the build in do_generate_asciidoc.sh, which also ensures
+// that the checked in html is up to date.
+// do_generate_asciidoc.sh can also be used to apply this header to all the
+// adoc files.
+// ENDOFHEADER
+
+== Launch Bar
+
+CBS projects rely on the *LaunchBar*. Make sure the launch bar plugin
+is installed and enabled. In the global preferences the launch bar can
+be enabled or disabled.
+
+image:launchbar_preferences.png[Launch Bar preferences]
+
+The launch bar exists out of several components:
+
+image:launchbar.png[Launch Bar]
+
+. Build button, to launch a build.
+. Run button, to launch a run. This button will change to a Debug
+button in Debug mode.
+. Stop button, to stop a Run or Debug session.
+. Launch mode selector. To change between Run and Debug mode.
+. Launch configuration selector.
+. Edit launch configuration. To change the launch configuration
+properties.
+. Target selector. Not always visible.
+. Edit target.

doc/org.eclipse.cdt.doc.user/src/getting_started/cbs_using_existing_code.adoc

@@ -0,0 +1,66 @@
+////
+Copyright (c) 2000, 2025 Contributors to the Eclipse Foundation
+This program and the accompanying materials
+are made available under the terms of the Eclipse Public License 2.0
+which accompanies this distribution, and is available at
+https://www.eclipse.org/legal/epl-2.0/
+
+SPDX-License-Identifier: EPL-2.0
+////
+
+// pull in shared headers, footers, etc
+:docinfo: shared
+
+// support image rendering and table of contents within GitHub
+ifdef::env-github[]
+:imagesdir: ../../images
+:toc:
+:toc-placement!:
+endif::[]
+
+// enable support for button, menu and keyboard macros
+:experimental:
+
+// Until ENDOFHEADER the content must match adoc-headers.txt for consistency,
+// this is checked by the build in do_generate_asciidoc.sh, which also ensures
+// that the checked in html is up to date.
+// do_generate_asciidoc.sh can also be used to apply this header to all the
+// adoc files.
+// ENDOFHEADER
+
+== Using existing code
+
+This tutorial describes how to use existing code for Core Build System
+projects.
+
+Using existing code is done by creating a new **empty** project on top of the
+existing code.
+
+=== Using an existing CMake project
+
+To create an empty CMake project select the template *Empty or Existing CMake
+Project* in the *New C/{cpp} Project* wizard.
+
+image:cbs_empty_cmake_project.png[Empty or Existing CMake Project]
+
+Then in the *New CMake Project* wizard deselect *Use default location*
+and set the location of the existing code.
+
+image:cbs_existing_code_cmake.png[Existing code CMake]
+
+More information about creating a CMake project is described in
+xref:new_cmake_proj.adoc[Creating a CMake project]
+
+=== Using an existing Makefile project
+
+Create a Makefile project as described in
+xref:new_cbs_makefile_proj.adoc[Creating a Core Build System Makefile project]
+with the following changes:
+
+In the *New Makefile Project* wizard deselect *Use default location*
+and set the location of the existing code, and deselect *Create Hello
+World Source and Makefile example*.
+
+image:cbs_existing_code_makefile.png[Existing code Makefile]
+
+icon:arrow-circle-right[] xref:cbs_launchbar.adoc[Next: Launch Bar]

doc/org.eclipse.cdt.doc.user/src/getting_started/cdt_w_basic.adoc

@@ -28,18 +28,13 @@ endif::[]
 // adoc files.
 // ENDOFHEADER
 
-== Tutorial: Creating a simple application
+== Tutorial: Creating a Managed Build System Makefile project
 
 In this tutorial, you will use the CDT to create a simple 'Hello World'
 application. This tutorial describes the process of creating a new {cpp}
 project where the build is automatically managed by the CDT, and running
 the program.
 
-*NOTE*: In earlier versions of the CDT, there were two separate project
-types: Managed make (automatically generated a makefile) and Standard
-make (required the user's makefile to build). Now with CDT, you just
-select a project type, and that determines what build system to use.
-
 To create a simple "Hello World" application using CDT, perform the
 following general steps:
 
@@ -57,10 +52,13 @@ image:cdt_w_basic02.png[Select File > New > Project menu
 option,width=591,height=183]
 +
 . Select the type of project to create. For this tutorial, expand the
-*{cpp}* folder and select *{cpp} Project* and click *Next*.
+*C/{cpp}* folder and select *C/{cpp} Project* and click *Next*.
+ +
+image:cdt_w_basic03a.png[Select project type]
+ +
+. Select *{cpp} Managed Build* and click *Next*.
  +
-image:cdt_w_basic03a.png[Select project
-type,width=525,height=500]
+image:cdt_w_basic03b.png[Select {cpp} Managed Build]
  +
 . The *{cpp} Project* wizard opens.
 +
@@ -139,12 +137,6 @@ populated with objects created from your code.
 image:cdt_w_basic13.png[C Editor with Outline
 view,width=731,height=333]
  +
-*NOTE:* You can specify a different editor, and add or modify existing
-code templates in *Window > Preferences*.
- +
-*OPTIONAL*: You can type additional code in this file, and then save the
-changes by clicking File > Save, or pressing *CTRL+S*.
- +
 Next, you will need to build your project before you can run it.
  +
 . Build your project by pressing *CTRL+B*, or select the project in the

doc/org.eclipse.cdt.doc.user/src/getting_started/cdt_w_newcpp.adoc

@@ -88,9 +88,9 @@ xref:cdt_w_newmake.adoc[image:ngnext.gif[Next
 icon,width=16,height=16]] *xref:cdt_w_newmake.adoc[Next: Creating your
 makefile]*
 
-xref:cdt_w_newproj.adoc[image:ngback.gif[Back
-icon,width=16,height=16]] *xref:cdt_w_newproj.adoc[Back: Creating your
-project]*
+xref:cdt_w_import.adoc[image:ngback.gif[Back
+icon,width=16,height=16]] *xref:cdt_w_import.adoc[Back: Importing an
+existing project]*
 
 image:ngconcepts.gif[Related concepts,width=143,height=21]
 

doc/org.eclipse.cdt.doc.user/src/getting_started/index_cbs.adoc

@@ -0,0 +1,41 @@
+////
+Copyright (c) 2000, 2025 Contributors to the Eclipse Foundation
+This program and the accompanying materials
+are made available under the terms of the Eclipse Public License 2.0
+which accompanies this distribution, and is available at
+https://www.eclipse.org/legal/epl-2.0/
+
+SPDX-License-Identifier: EPL-2.0
+////
+
+// pull in shared headers, footers, etc
+:docinfo: shared
+
+// support image rendering and table of contents within GitHub
+ifdef::env-github[]
+:imagesdir: ../../images
+:toc:
+:toc-placement!:
+endif::[]
+
+// enable support for button, menu and keyboard macros
+:experimental:
+
+// Until ENDOFHEADER the content must match adoc-headers.txt for consistency,
+// this is checked by the build in do_generate_asciidoc.sh, which also ensures
+// that the checked in html is up to date.
+// do_generate_asciidoc.sh can also be used to apply this header to all the
+// adoc files.
+// ENDOFHEADER
+
+= Core Build System contents
+
+xref:core_build_system.adoc[Core Build System]
+
+xref:new_cmake_proj.adoc[Creating a CMake project]
+
+xref:new_cbs_makefile_proj.adoc[Creating a Core Build System Makefile project]
+
+xref:cbs_using_existing_code.adoc[Using existing code]
+
+xref:cbs_launchbar.adoc[Launch Bar]