example of variables usage for gitversion execute for azure pipelines

docs/examples/github/gitversion/execute.md

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+# Example
+
+```yaml
+  steps:
+  - name: Fetch all history for all tags and branches
+    run: git fetch --prune --unshallow
+  - name: Use GitVersion
+    id: gitversion # step id used as reference for output values
+    uses: gittools/actions/gitversion/execute@v0.9
+  - run: |
+      echo "Major: ${{ steps.gitversion.outputs.major }}"
+      echo "Minor: ${{ steps.gitversion.outputs.minor }}"
+      echo "Patch: ${{ steps.gitversion.outputs.patch }}"
+    name: Output
+```

docs/examples/github/gitversion/setup.md

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+# Example
+
+```yaml
+  steps:
+  - name: Checkout
+    uses: actions/checkout@v2
+  - name: Install GitVersion
+    uses: gittools/actions/gitversion/setup@v0.9
+    with:
+        versionSpec: '5.1.x'
+```