docs: README with install notes

README.MD

@@ -1,28 +1,49 @@
-# Sites.yml | Pantheon.yml Validator
+# Pantheon YML Validator
 
-A utility for validating a sites.yml file on a pantheon site during WordPress multisites' search-replace tasks. Asprirationally to include pantheon.yml validation in the future.
+A utility for validating a sites.yml file on a Pantheon site during WordPress multisites' search-replace tasks. Asprirationally to include pantheon.yml validation in the future.
 
-# Usage
+## Usage
 
-## Sites.yml
+### Sites.yml
 ```
 $ pyml-validator sites -f path/to/sites.yml
 ```
 
 See [this annotated fixture](./fixtures/sites/valid.yml) for an example of a valid sites.yml file.
 
-## Pantheon.yml
-Note, validation of pantheon.yml is unimplemented, so any file reads as valid.
+## Install
+
+### [Download the latest binary](https://github.com/pantheon-systems/pyml-validator/releases/latest)
+
+Use wget to download, gzipped pre-compiled binaries:
+For instance, VERSION=v0.0.11 and BINARY=pyml-validator_linux_amd64
+
+### Compressed via tar.gz
+```bash
+wget https://github.com/pantheon-systems/pyml-validator/releases/download/${VERSION}/${BINARY}.tar.gz -O - |\
+  tar xz && mv ${BINARY} /usr/bin/pyml-validator
+```
+
+### Plain binary
+
+```bash
+wget https://github.com/pantheon-systems/pyml-validator/releases/download/${VERSION}/${BINARY} -O /usr/bin/pyml-validator &&\
+    chmod +x /usr/bin/pyml-validator
 ```
-$ pyml-validator pantheon -f path/to/pantheon.yml
+
+### Latest version
+
+```bash
+wget https://github.com/pantheon-systems/pyml-validator/releases/latest/download/pyml-validator_linux_amd64 -O /usr/bin/pyml-validator &&\
+    chmod +x /usr/bin/pyml-validator
 ```
 
-# Testing
+## Testing
 
 [![Coverage Status](https://coveralls.io/repos/github/pantheon-systems/pyml-validator/badge.svg?t=PGhafd)](https://coveralls.io/github/pantheon-systems/pyml-validator)
 
 `make test` runs linting and testing.
 
-# Releases
+## Releases
 
-Automatically releases on merge to main via autotag + goreleaser. See [Autotag Readme](https://github.com/pantheon-systems/autotag) for details on how the SemVer is determined. Note, with goreleaser, each commit merged will become a line item in the release's Changelog. Take note to use squashing and/or rebase to ensure helpful and informative commit messages.
+Automatically releases on merge to main via autotag + goreleaser. See [Autotag Readme](https://github.com/pantheon-systems/autotag) for details on how the SemVer is determined. With goreleaser, each commit merged will become a line item in the release's Changelog. Take note to use squashing and/or rebase to ensure helpful and informative commit messages.