Add feature docs and document development tooling

tools/collections/README.md

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+### Inventory Updates Cross-Development with Collections
+
+Inventory updates in production use vendored collections baked into the image,
+which are downloaded from Ansible Galaxy in the build steps.
+
+This gives instructions to short-circuit that process for a faster development process.
+
+Running this script will do a `git clone` for all the relevant collections
+into the folder `awx/plugins/collections`.
+
+```
+source tools/collections/clone_vendor.sh
+```
+
+After this is completed, you must change the path where the server looks
+for the vendored inventory collections.
+Add this line to your local settings:
+
+```
+INVENTORY_COLLECTIONS_ROOT = '/awx_devel/awx/plugins/collections'
+```
+
+Then when you run an inventory update of a particular type, it should
+use the cloned collection.
+This allows you to cd into a particular collection, add remotes,
+change branches, etc.
+
+#### Extra Build Steps
+
+This will not work correctly in all circumstances.
+Some collections make changes at build-time.
+
+In particular, the foreman inventory plugin needs the NAME attribute changed to
+the fully-qualified collection name, and will fail if this is not done.