Add actions for gssoc21

Author: Pranav016

.github/workflows/close.yml

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+name: Close
+
+on:
+  pull_request:
+    types: [opened]
+  issue_comment:
+    types: [created]
+
+jobs:
+  add_label:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-ecosystem/action-add-labels@v1
+        if: ${{ startsWith(github.event.comment.body, '/close-pr/') }}
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          labels: Close-PR

.github/workflows/level0.yml

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+name: level0
+
+on:
+  pull_request:
+    types: [opened]
+  issue_comment:
+    types: [created]
+
+jobs:
+  add_label:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-ecosystem/action-add-labels@v1
+        if: ${{ startsWith(github.event.comment.body, '/level0/') }}
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          labels: Level0

.github/workflows/level1.yml

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+name: level1
+
+on:
+  pull_request:
+    types: [opened]
+  issue_comment:
+    types: [created]
+
+jobs:
+  add_label:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-ecosystem/action-add-labels@v1
+        if: ${{ startsWith(github.event.comment.body, '/level1/') }}
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          labels: Level1

.github/workflows/level2.yml

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+name: level2
+
+on:
+  pull_request:
+    types: [opened]
+  issue_comment:
+    types: [created]
+
+jobs:
+  add_label:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-ecosystem/action-add-labels@v1
+        if: ${{ startsWith(github.event.comment.body, '/level2/') }}
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          labels: Level2

.github/workflows/level3.yml

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+name: level3
+
+on:
+  pull_request:
+    types: [opened]
+  issue_comment:
+    types: [created]
+
+jobs:
+  add_label:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-ecosystem/action-add-labels@v1
+        if: ${{ startsWith(github.event.comment.body, '/level3/') }}
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          labels: Level3

.github/workflows/merge.yml

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+name: Merge
+
+on:
+  pull_request:
+    types: [opened]
+  issue_comment:
+    types: [created]
+
+jobs:
+  add_label:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-ecosystem/action-add-labels@v1
+        if: ${{ startsWith(github.event.comment.body, '/merge/') }}
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          labels: ready-to-merge