add json lint actions

Author: ishanrai05

.github/workflows/jsonlint.yml

@@ -0,0 +1,19 @@
+name: Check Json format
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2.2.0
+    - name: Install node
+      run: |
+        sudo apt install nodejs
+    - name: Install jsonlint
+      run: |
+        sudo npm install -g jsonlint
+    - name: Lint with jsonlint
+      run: |
+        for file in $(find $(git diff -U0 master --name-only) -iname "*.json"); do npx jsonlint $file; done