feat(ci): adding github action to use typos to check spelling (#267)

Signed-off-by: vsoch <vsoch@users.noreply.github.com>

Co-authored-by: vsoch <vsoch@users.noreply.github.com>

docs/github-action.md

@@ -0,0 +1,48 @@
+# GitHub Action
+
+If you want an easy way to test your repository spelling (or a subset of files)
+you can use the Typos Action! It is served from this repository, and can
+easily be used as follows:
+
+```yaml
+name: Test GitHub Action
+on: [pull_request]
+
+jobs:
+  run:
+    name: Spell Check with Typos
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout Actions Repository
+      uses: actions/checkout@v2
+
+    - name: Check spelling of file.txt
+      uses: crate-ci/typos@main
+      with: 
+        files: ./file.txt
+
+    - name: Use custom config file
+      uses: crate-ci/typos@main
+      with: 
+        files: ./file.txt
+        config: ./myconfig.toml
+
+    - name: Ignore implicit configuration file
+      uses: crate-ci/typos@main
+      with: 
+        files: ./file.txt
+        isolated: true
+```
+
+**Important** for any of the examples above, make sure that you choose
+a release or commit as a version, and not a branch (which is a moving target).
+Also make sure when referencing relative file paths to use `./` (e.g., `./file.txt` instead of
+`file.txt`.
+
+## Variables
+
+| Name | Description | Required | Default |
+|------|-------------|----------|---------|
+| files| Files or patterns to check | false | If not defined, entire repository is checked |
+| isolated | Ignore implicit configuration files | false | false|
+| config | Use a custom config file (must exist) | false | not set |