Add README

README.md

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+# depup - Action which updates dependencies automatically
+
+## Inputs
+
+```yaml
+inputs:
+  github_token:
+    description: 'GITHUB_TOKEN to get latest version with GitHub Release API'
+    default: '${{ github.token }}'
+  file:
+    description: 'target file'
+    required: true
+  version_name:
+    description: 'target version name. e.g. REVIEWDOG_VERSION'
+    required: true
+  repo:
+    description: 'target GitHub repository. e.g. reviewdog/reviewdog'
+    required: true
+```
+
+## Example usage
+
+### [.github/workflows/depup.yml](.github/workflows/depup.yml)
+
+```yml
+name: depup
+on:
+  schedule:
+    - cron:  '14 14 * * *'
+
+jobs:
+  depup:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: haya14busa/action-depup@v1
+        id: depup
+        with:
+          file: testdata/testfile
+          version_name: REVIEWDOG_VERSION
+          repo: reviewdog/reviewdog
+
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v2
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          title: "chore(deps): update reviewdog to ${{ steps.depup.outputs.latest }}"
+          commit-message: "chore(deps): update reviewdog to ${{ steps.depup.outputs.latest }}"
+          body: |
+            Update reviewdog to [${{ steps.depup.outputs.latest }}](https://github.com/reviewdog/reviewdog/releases/tag/v${{ steps.depup.outputs.latest }})
+
+            This PR is auto generated by [depup workflow](https://github.com/${{ github.repository }}/actions?query=workflow%3Adepup).
+          branch: depup/reviewdog
+```