add markdown lint (#113)

fix #112

Reviewed-on: https://gitea.com/gitea/awesome-gitea/pulls/113
Reviewed-by: techknowlogick <techknowlogick@noreply.gitea.io>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-committed-by: Lunny Xiao <xiaolunwen@gmail.com>

.gitea/workflows/lint.yml

@@ -0,0 +1,14 @@
+name: lint
+on:
+  - push
+  - pull_request
+
+jobs:
+  lint:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: lint
+        uses: https://github.com/articulate/actions-markdownlint@v1
+        with:
+          files: '**/*.md'