README.md: update installation/usage information

Add links to tox documentation

Add section about vendoring the plugin

README.md

@@ -16,15 +16,38 @@ virtualenv for each test environment.
 
 1. Install `tox-ignore-env-name-mismatch` in the same environment as `tox`.
 2. Set `runner = ignore_env_name_mismatch` in a testenv to opt-out of recreating the virtualenv when the env name changes.
-* To always use this plugin, specify `requires = tox-ignore-env-name-mismatch` in the `[tox]` section
-  of `tox.ini`
+
+### To always use this plugin:
+
+#### Install/provision
+
+* Specify `requires = tox-ignore-env-name-mismatch~=0.2.0` in the `[tox]`
+  section of `tox.ini`
+
+This will cause `tox` to provision a new virtualenv for `tox` itself and other
+dependencies named in the
+[`requires`](https://tox.wiki/en/latest/config.html#requires) key if the current
+environment does not meet the specification.
+
+Pinning the plugin to a minor version is _highly recommended_ to avoid breaking
+changes.
+
+#### Vendor
+
+* copy `src/tox_ignore_env_name_mismatch.py` to the root of you project
+  directory as `toxfile.py`
+
+This uses the tox4's new ["inline
+plugin"](https://tox.wiki/en/latest/plugins.html#module-tox.plugin) approach
+instead of relying on the provisioning system (which [can be disabled via
+CLI](https://tox.wiki/en/latest/cli_interface.html#tox---no-provision)).
 
 ## Example
 
 ```
 [tox]
 envlist = py39,py310,py311,lint,format,types
-requires = tox-ignore-env-name-mismatch
+requires = tox-ignore-env-name-mismatch~=0.2.0
 
 [testenv]
 deps = pytest