merge PR #29 add PR Labeler action

PR: add PR Labeler action

.github/labeler.yml

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+# Configuration for PR Labeller Action
+# See: https://github.com/actions/labeler/blob/master/README.md
+
+# Examples
+# Add 'label1' to PR if anything changes within 'example' folder or any subfolders
+# label1:
+#   - example/**/*
+
+# Add 'label2' to PR if any file changes within 'example2' folder
+# label2: example2/*
+
+Action:
+  - action.yml
+
+Docker:
+  - Dockerfile
+  - .dockerignore
+
+Options: 
+  - src/CodeCoverageSummary/CommandLineOptions.cs
+
+Parsing:
+  - src/CodeCoverageSummary/CodeSummary.cs
+  - src/CodeCoverageSummary/Program.cs
+
+Summary:
+  - src/CodeCoverageSummary/CodeSummary.cs
+  - src/CodeCoverageSummary/Program.cs
+
+DevOps:
+  - .github/**/*

.github/workflows/pr-labeler.yml

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+# Applies labels to pull requests based on paths & files modified in the pull request.
+#
+# .github/labeler.yml contains the list of labels & files / folders to match, see:
+# https://github.com/actions/labeler/blob/master/README.md
+
+name: PR Labeler
+on: 
+  pull_request_target:
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/labeler@v3
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"