Labels and greetings Github workflows

.github/workflows/greetings.yml

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+name: Greetings
+on: [pull_request, issues]
+jobs:
+  greeting:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/first-interaction@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          issue-message: 'Thanks for creating your first issue :+1:\nFeel free to use [Slack](https://join.slack.com/t/qdm12/shared_invite/enQtODMwMDQyMTAxMjY1LTU1YjE1MTVhNTBmNTViNzJiZmQwZWRmMDhhZjEyNjVhZGM4YmIxOTMxOTYzN2U0N2U2YjQ2MDk3YmYxN2NiNTc) if you just need some quick help or want to chat'
+          pr-message: 'Thank you so much for contributing, that means a lot to me :wink:'

.github/workflows/labels.yml

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+name: labels
+on:
+  push:
+    branches: ["master"]
+    paths:
+      - '.github/labels.yml'
+      - '.github/workflows/labels.yml'
+jobs:
+  labeler:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Labeler
+        if: success()
+        uses: crazy-max/ghaction-github-labeler@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}