add loc workflow

.github/workflows/loc.yml

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+name: 'loc'
+
+on: # rebuild any PRs and main branch changes
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  loc:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./app
+        id: loc
+      # Use the output from the `loc` step
+      - name: Get the LOC
+        run: echo "The project has ${{ steps.loc.outputs.locs }} lines of code"

app/action.yml

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+name: 'lines-of_code-counter'
+description: 'Github Action that counts lines of code'
+author: 'Vasyl Prokudin'
+inputs:
+  fileOrFolderToProcess:
+    required: false
+    description: 'The file or folder to process'
+    default: '.'
+  filesAndFoldersToIgnore:
+    required: false
+    description: 'A list of directories to ignore. Supports glob patterns.'
+    default: '["node_modules", ".git", "dist", ".github"]'
+outputs:
+  locs:
+    description: 'The amount of LOC of your project without comments and empty lines'
+runs:
+  using: 'node12'
+  main: 'dist/index.js'