fix: add github actions docs to README

Author: packagemap

README.md

@@ -8,7 +8,22 @@ Check out the site at [https://packagemap.co](https://packagemap.co)
 
 Code review just got a lot easier! Visualise your code. 
 
-## Getting started
+## Getting started - github action
+
+Use the github action:
+```yaml
+- name: PackageMap java parser Github action
+  uses: packagemap/packagemap-java-parser@v0.0.2
+  with:
+    src_dir: 'src/main/java'
+    base: 'com.mycompany'
+    api_key: ${{ secrets.PACKAGEMAP_KEY }}
+```
+
+1. Add the github action config
+2. Add a PACKAGEMAP_KEY secret to your repo in the format `user_id:secret_key`
+
+## Getting started - local
 
 1. Sign up at [packagemap.co](http://packagemap.co) to get an API Access key, and API Secret key.
 2. Download the jar from the release page and run it

action.yaml

@@ -18,10 +18,11 @@ outputs:
     description: 'link to the packagemap ui'
 runs:
   using: 'docker'
-  image: 'packagemap/packagemap-java-parser:0.0.2'
+  image: 'docker://packagemap/packagemap-java-parser:0.0.2'
   env:
-    - PACKAGEMAP_KEY=${{ inputs.api_key }}
+    PACKAGEMAP_KEY: ${{ inputs.api_key }}
   args:
-    - --base ${{ inputs.base }}
+    - --base 
+    - ${{ inputs.base }}
     - ${{ inputs.src_dir }}