Add information to README

README.rst

@@ -9,7 +9,7 @@ circfirm
    :target: https://github.com/tekktrik/circfirm/actions
    :alt: GitHub Actions Workflow Status
 
-.. image:: https://codecov.io/gh/tekktrik/circfirm/graph/badge.svg?token=UM67L1VZZ1 
+.. image:: https://codecov.io/gh/tekktrik/circfirm/graph/badge.svg?token=UM67L1VZZ1
    :target: https://codecov.io/gh/tekktrik/circfirm
    :alt: Codecov Report
 
@@ -21,4 +21,56 @@ circfirm
    :target: https://pypi.org/project/circfirm/
    :alt: PyPI - Downloads
 
-A CLI tool for updating the firmware for CircuitPython boards
+A CLI tool for updating the firmware for CircuitPython boards
+
+Installation
+============
+
+The best way to install ``circfirm`` is by using [``pipx``](https://github.com/pypa/pipx),
+which creates an isolated virtual environment for the dependencies:
+
+.. code-block:: shell
+
+    pipx install circfirm
+
+You can also just use ``pip`` to install it, if the dependencies won't cause issues:
+
+.. code-block:: shell
+
+    pip install circfirm
+
+Usage
+=====
+
+The follow commands show some of the functionality of ``circfirm``:
+
+.. code-block:: shell
+
+    # Install a version of CircuitPython to a connected board
+    circfirm install 8.0.0
+
+    # Install a version of CircuitPython in French to a connected board
+    circfirm install 8.0.0 --language fr
+
+    # List all the cached (previously downloaded) CircuitPython versions
+    circfirm cache list
+
+    # List all the cached CircuitPython versions for a speciic board
+    circfirm cache list --board feather_m4_express
+
+    # Save a version of CircuitPython to the cache
+    # (You can also use the --language option here)
+    circfirm cache save feather_m4_express 8.0.0
+
+    # Clear the cached CircuitPython versions
+    circfirm cache clear
+
+    # You can use --board, --version, and --language options to further specify
+    # what firmwares should be cleared - this clears version 7.0.0 firmwares for
+    # all boards and in all languages
+    circfirm cache clear --version 7.0.0
+
+    # See help/information about circfirm or any specific command using --help
+    circfirm --help
+    circfirm install --help
+    circfirm cache save --help