Try automating 'ready for review' on proposals. (#496)

.github/workflows/ready_for_review.yaml

@@ -0,0 +1,20 @@
+# Part of the Carbon Language project, under the Apache License v2.0 with LLVM
+# Exceptions. See /LICENSE for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+name: Move ready proposals to RFC
+
+on:
+  pull_request:
+    types: [ready_for_review]
+
+jobs:
+  update-project:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Update project column
+        uses: carbon-language/action-update-project@v1.0
+        with:
+          project_url: https://github.com/carbon-language/carbon-lang/projects/1
+          column_name: RFC
+          github_token: ${{ secrets.GITHUB_TOKEN }}