GitHub actions (#544)

* Create label.yml

* Create labeler.yml

* Create greetings.yml

.github/labeler.yml

@@ -0,0 +1,7 @@
+Status%3A%20Review%20Needed:
+  - Comanche055/**/*
+  - Luminary099/**/*
+Type%3A%20Proof:
+  - Comanche055/**/*
+  - Luminary099/**/*
+  

.github/workflows/greetings.yml

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+name: Greetings
+
+on: [pull_request]
+
+jobs:
+  greeting:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/first-interaction@v1
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        pr-message: 'Thank you for contributing to Apollo 11!'' first pr'

.github/workflows/label.yml

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+# This workflow will triage pull requests and apply a label based on the
+# paths that are modified in the pull request.
+#
+# To use this workflow, you will need to set up a .github/labeler.yml
+# file with configuration.  For more information, see:
+# https://github.com/actions/labeler/blob/master/README.md
+
+name: Labeler
+on: [pull_request]
+
+jobs:
+  label:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/labeler@v2
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"