Update Install doc for bazel build (#1046)

INSTALL.md

@@ -28,7 +28,7 @@ build systems for opentelemetry-cpp.
   exporter need nlohmann-json to build. This is covered in the build
   instructions for each of these components.
 
-### Building as Standalone CMake Project
+### Building as standalone CMake Project
 
 1. Getting the opentelementry-cpp source:
 
@@ -115,7 +115,7 @@ build systems for opentelemetry-cpp.
    $
    ```
 
-### Incorporating Into An Existing CMake Project
+### Incorporating into an existing CMake Project
 
 To use the library from a CMake project, you can locate it directly with
  `find_package` and use the imported targets from generated package
@@ -151,7 +151,7 @@ SDK with their unittests. We use 3.7.2 in our build system.
 
 To install Bazel, consult the [Installing Bazel](https://docs.bazel.build/versions/3.7.0/install.html) guide.
 
-### Building as Standalone Bazel Project
+### Building as standalone Bazel Project
 
 1. Getting the opentelementry-cpp source:
 
@@ -189,3 +189,50 @@ To install Bazel, consult the [Installing Bazel](https://docs.bazel.build/versio
    ```
 
 4. The build artifacts will be located under `bazel-bin`
+
+### Incorporating into an existing Bazel Project
+
+- WORKSPACE file:
+
+```console
+http_archive(
+    name = "io_opentelemetry_cpp",
+    sha256 = "<sha256>",
+    strip_prefix = "opentelemetry-cpp-1.0.1",
+    urls = [
+        "https://github.com/open-telemetry/opentelemetry-cpp/archive/refs/tags/v1.0.1.tar.gz"
+    ],
+)
+
+# Load OpenTelemetry dependencies after load.
+load("@io_opentelemetry_cpp//bazel:repository.bzl", "opentelemetry_cpp_deps")
+
+opentelemetry_cpp_deps()
+
+# Load gRPC dependencies after load.
+load("@com_github_grpc_grpc//bazel:grpc_deps.bzl", "grpc_deps")
+
+grpc_deps()
+
+# Load extra gRPC dependencies due to https://github.com/grpc/grpc/issues/20511
+load("@com_github_grpc_grpc//bazel:grpc_extra_deps.bzl", "grpc_extra_deps")
+
+grpc_extra_deps()
+
+```
+
+- Component level BUILD file:
+
+```console
+cc_library(
+   name = "<name>"
+   ...
+   deps = [
+      "@io_opentelemetry_cpp//api",
+      "@io_opentelemetry_cpp//exporters/otlp:otlp_exporter",
+      "@io_opentelemetry_cpp//sdk/src/trace",
+      ...
+   ],
+   ...
+)
+```

bazel/repository.bzl

@@ -87,7 +87,7 @@ def opentelemetry_cpp_deps():
     maybe(
         http_archive,
         name = "curl",
-        build_file = "@//bazel:curl.BUILD",
+        build_file = "@io_opentelemetry_cpp//bazel:curl.BUILD",
         sha256 = "ba98332752257b47b9dea6d8c0ad25ec1745c20424f1dd3ff2c99ab59e97cf91",
         strip_prefix = "curl-7.73.0",
         urls = ["https://curl.haxx.se/download/curl-7.73.0.tar.gz"],