Add README

Signed-off-by: Alex Vanin <a.vanin@yadro.com>

README.md

@@ -0,0 +1,33 @@
+# dco-go
+
+A Forgejo action that verifies commits in pull-request all include Developer Certificate of Origin (DCO) information and proper header.
+
+## Usage
+
+Add .forgejo/workflows/dco.yml with the following
+
+```yaml
+on: [pull_request]
+
+jobs:
+  dco:
+    name: DCO
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Setup Go
+        uses: actions/setup-go@v3
+        with:
+          go-version: '1.20'
+
+      - name: Run commit format checker
+        uses: https://git.frostfs.info/TrueCloudLab/dco-go@v1
+        with:
+          from: 406c2324
+
+```
+
+Action checks through whole repository history. Specify last commit to check bound with `from` parameter.