Created a first draft of this action. (#14)

Reviewed-on: #14
Co-authored-by: Philipp Horstenkamp <philipp@horstenkamp.de>
Co-committed-by: Philipp Horstenkamp <philipp@horstenkamp.de>

action.yml

@@ -0,0 +1,33 @@
+name: Create an PR action
+description: Creates a pull request for a branch if it does not already exist
+inputs:
+  token:
+    description: Token for authentication. Github Token will not work.
+    required: true
+  branch:
+    description: Branch for which to create the PR
+    required: true
+  base_branch:
+    description: Branch in which should be mergbed. Defaults to main.
+    required: false
+  title:
+    description: Title of the pull request
+    required: true
+  body:
+    description: Body of the pull request
+    required: false
+    default: Some default body!
+  assignees:
+    description: Comma-separated list of assignees for the pull request
+    required: false
+    default: ''
+  reviewers:
+    description: Comma-separated list of reviewers for the pull request
+    required: false
+    default: ''
+outputs:
+  pull_request_url:
+    description: URL of the created pull request
+runs:
+  using: node12
+  main: index.js