add workflow

.github/workflows/get-version.js

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+var fs = require('fs');
+console.log(JSON.parse(fs.readFileSync('module.json', 'utf8')).version);

.github/workflows/main.yml

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+name: personal-markers CI
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Get Version                                   # Run the script that returns the version from `module.json`
+      shell: bash
+      id: get-version
+      run: echo "::set-output name=version::$(node ./.github/workflows/get-version.js)"
+    - run: zip -r ./personal-markers.zip module.json marker.js assets/ lang/                                      # Add folders/files here
+    - name: Create Release                                # Create an additional release for this version
+      id: create_versioned_release
+      uses: ncipollo/release-action@v1
+      with:
+        allowUpdates: true # set to false if you do not want to allow updates on existing releases
+        name: Release ${{ steps.get-version.outputs.version }} # Use the version in the name
+        draft: false
+        prerelease: false
+        token: ${{ secrets.GITHUB_TOKEN }}
+        artifacts: './module.json,./personal-markers.zip'                                                                 # don't forget to rename module zip thing
+        tag: ${{ steps.get-version.outputs.version }} # Use the version as the tag
+    - name: Create Release
+      id: create_latest_release
+      uses: ncipollo/release-action@v1
+      if: endsWith(github.ref, 'master') # Only update the latest release when pushing to the master branch
+      with:
+        allowUpdates: true
+        name: Latest
+        draft: false
+        prerelease: false
+        token: ${{ secrets.GITHUB_TOKEN }}
+        artifacts: './module.json,./personal-markers.zip'                                                                 # don't forget to rename module zip thing
+        tag: latest