Create README.md

Author: Cory Schwartz

README.md

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+# testground-github-action
+
+Submit jobs to [testground](https://testground.ai) and view the outcome in Github.
+
+
+## usage:
+
+As a code checker for PRs:
+
+```
+---
+name: Testground PR Checker
+
+on: [push]
+
+jobs:
+  testground:
+    runs-on: ubuntu-latest
+    name: ${{ matrix.composition_file }}
+    strategy:
+      matrix:
+        include:
+          - backend_addr: <testground_daemon>
+            backend_proto: <http/https>
+            plan_directory: </path/to/testplan/directory>
+            composition_file: </path/to/composition.toml
+    steps:
+      - uses: actions/checkout@v2
+      - name: ${{ matrix.composition_file }}
+        id: 
+        uses: coryschwartz/[email protected]
+        with:
+          backend_addr: ${{ matrix.backend_addr }}
+          backend_proto: ${{ matrix.backend_proto }}
+          plan_directory: ${{ matrix.plan_directory }}
+          composition_file: ${{ matrix.composition_file }}
+
+```