Labels and greetings Github workflows

.github/labels.yml

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+- name: ":robot: bot"
+  color: "69cde9"
+  description: ""
+- name: ":bug: bug"
+  color: "b60205"
+  description: ""
+- name: ":game_die: dependencies"
+  color: "0366d6"
+  description: ""
+- name: ":memo: documentation"
+  color: "c5def5"
+  description: ""
+- name: ":busts_in_silhouette: duplicate"
+  color: "cccccc"
+  description: ""
+- name: ":sparkles: enhancement"
+  color: "0054ca"
+  description: ""
+- name: ":bulb: feature request"
+  color: "0e8a16"
+  description: ""
+- name: ":mega: feedback"
+  color: "03a9f4"
+  description: ""
+- name: ":rocket: future maybe"
+  color: "fef2c0"
+  description: ""
+- name: ":hatching_chick: good first issue"
+  color: "7057ff"
+  description: ""
+- name: ":pray: help wanted"
+  color: "4caf50"
+  description: ""
+- name: ":hand: hold"
+  color: "24292f"
+  description: ""
+- name: ":no_entry_sign: invalid"
+  color: "e6e6e6"
+  description: ""
+- name: ":interrobang: maybe bug"
+  color: "ff5722"
+  description: ""
+- name: ":thinking: needs more info"
+  color: "795548"
+  description: ""
+- name: ":question: question"
+  color: "3f51b5"
+  description: ""
+- name: ":coffin: wontfix"
+  color: "ffffff"
+  description: ""

.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 }}