docs: update schema section in readme (#48)

* docs: update readme

README.md

@@ -5,18 +5,51 @@
 
 ![image](docs/source/images/cat-vrs-transparent-bg.png)
 
+## Using the schema
 
-# How to set up a venv and update the schemata from the source.yaml files: (Guide for VSCode)
-
-1. Use the following code to install the venv in the root directory that contains the requirements.txt file.  Note that requirements.txt may be hidden and not show up with `ls`, but it should show up if you ise `ls -a` to list hidden files.
-    > `python3 -m venv venv`
-    >
-    > `source venv/bin/activate`
-    >
-    > `pip install -U setuptools pip`
-    >
-    > `pip install -r .requirements.txt`
-2. Then run the following code to pull in all of the submodule content:
-    > `git submodule update --init --recursive`
-3. The venv should be all set up to update the `.rst` files as they are updated. `.rst` files inside the `docs/source` directory are static and can be edited directly.  (you will need to install aan `.rst`-compatible extension to view the outputs inside the editor, however.  I currently have both reStructuredText and RST Preview installed.) The `.rst` and `.json` files for the schemata are generated by making edits to the `-source.yaml` files, and thenrunning the `Makefile`.  To run the `Makefile`, `cd` into the `cat-vrs/schema` directory which contains it and run the following line of code to update everything:
-    > `make all` 
+The schema is available in the [schema/](./schema/) directory, in both yaml and json versions. 
+It conforms to JSON Schema Draft 2020-12. For a list of
+libraries that support JSON schema, see
+[JSONSchema>Tools](https://json-schema.org/tools).
+
+## Installing for development
+
+Fork the repo at <https://github.com/ga4gh/cat-vrs>.
+
+    git clone --recurse-submodules [email protected]:YOUR_GITHUB_ID/cat-vrs.git
+    cd cat-vrs
+    make devready
+    source venv/3.12/bin/activate
+
+If you already cloned the repo, but forgot to include `--recurse-submodules` you can run:
+
+    git submodule update --init --recursive
+
+## Contributing to the schema
+
+Cat-VRS uses [cat-vrs-source.yaml](./schema/cat-vrs/cat-vrs-source.yaml) as the source
+document for JSON Schema.
+
+To create the corresponding def and json files after making changes to the source
+document, from the root directory:
+
+    cd schema
+    make all
+
+## Contributing to the docs
+
+The Cat-VRS specification documentation is written in reStructuredText and located in
+[docs/source](docs/source/). Commits to this repo are built automatically at
+<https://vrsatile.readthedocs.io/en/latest/catvars/index.html#>.
+
+To build documentation locally, you must install [entr](https://eradman.com/entrproject/):
+
+    brew install entr
+
+Then from the root directory:
+
+    cd docs
+    make clean watch &
+
+Then, open [docs/build/html/index.html](./docs/build/html/index.html). The above make
+command should build docs when source changes. (Some types of changes require recleaning and building.)