Add the autoformat actions to autoformat the code in this repo. (#105)

.github/workflows/autoformat-push.yml

@@ -0,0 +1,23 @@
+name: Autoformat code - push results
+on:
+  workflow_run:
+    workflows: ["Autoformat code"]
+    types:
+      - completed
+
+permissions:
+  pull-requests: write
+  contents: write
+
+jobs:
+  push-and-notify:
+    name: Push autoformatted code and notify user
+    runs-on: ubuntu-latest
+    if: >
+      github.event.workflow_run.event == 'pull_request' &&
+      github.event.workflow_run.conclusion == 'success'
+    steps:
+      - name: 'Push autoformatted patch'
+        uses: rolfbjarne/autoformat-push@v0.1
+        with:
+          githubToken: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/autoformat.yml

@@ -0,0 +1,17 @@
+name: Autoformat code
+on: pull_request
+
+# This action only need a single permission in order to autoformat the code.
+permissions:
+  contents: read
+
+jobs:
+  autoformat-code:
+    name: Autoformat code
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: 'Autoformat'
+      uses: rolfbjarne/autoformat@v0.1
+      with:
+        projects: "Xamarin.MacDev.sln"