ci: add PR title check (#201)

Author: gruebel

.github/workflows/pr_naming.yml

@@ -0,0 +1,15 @@
+name: PR Conventional Commit Validation
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, edited]
+
+jobs:
+  validate-pr-title:
+    runs-on: ubuntu-latest
+    steps:
+      - name: PR Conventional Commit Validation
+        uses:  ytanikin/pr-conventional-commits@1.4.1
+        with:
+          task_types: '["build","chore","ci","docs","feat","fix","perf","refactor","revert","test"]'
+          add_label: 'false'

CONTRIBUTING.md

@@ -49,6 +49,11 @@ Open a pull request against the main
 [opentelemetry-rust-contrib](https://github.com/open-telemetry/opentelemetry-rust-contrib)
 repo.
 
+Your pull request should be named according to the
+[conventional commits](https://www.conventionalcommits.org/en/v1.0.0/) standard. This ensures that
+when the PR is squashed into `main`, the resulting commit message is consistent and makes it easier
+for us to generate a changelog  standard.
+
 > **Note**
 > It is recommended to run [pre-commit script](precommit.sh) from the root of
 the repo to catch any issues locally.