docs: add README

README.md

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+# GitHub Action for exporting JSONResume
+
+This action exports your resume in [JSONResume](https://jsonresume.org/) to **HTML**.
+
+This can be combined with other actions to publish your resume as a Github page.
+
+> Example: https://kelvintaywl.github.io/resume
+
+## Inputs
+
+| Name | Description | Default |
+| --- | --- | --- |
+| theme | JSONResume theme name. See https://jsonresume.org/themes/ | `flat` |
+| resume_filepath | file path to your resume in JSONResume format | `resume.json` |
+| output_filepath | output file path | `index.html` |
+
+## Example Workflows
+
+### To publish your resume as a Github page
+
+> This example assumes you have a resume.json at the **root directory of your repository**. 
+
+> In addition, this assumes you have set up your GitHub pages on this repository [to reference the `docs/` folder as your source](https://docs.github.com/en/free-pro-team@latest/github/working-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site#choosing-a-publishing-source).
+
+```yaml
+# example GitHub workflow
+
+name: Publish resume in JSONResume format as Github Page
+
+on:
+  push:
+    branches: [ master ]
+
+jobs:
+  check_run:
+    runs-on: ubuntu-latest
+    if: "! contains(github.event.head_commit.message, '[ci skip]')"
+    steps:
+      - run: echo "${{ github.event.head_commit.message }}"
+
+  build:
+    runs-on: ubuntu-latest
+    needs: check_run
+    steps:
+      - uses: actions/checkout@v2
+      - uses: kelvintaywl/action-jsonresume-export@v1
+        name: Export resume as HTML
+        with:
+          theme: macchiato
+          resume_filepath: resume.json
+          # modifies the index.html in-place
+          output_filepath: docs/index.html
+      - name: Commit published HTML
+        id: commit
+        run: |
+          git config --local user.email "[email protected]"
+          git config --local user.name "GitHub Action"
+          if [ -n "$(git status --porcelain docs/index.html)" ]; then
+            git add docs/index.html
+            git commit -m "[ci skip] chore(docs/index.html): update resume page"
+            echo ::set-output name=exit_code::0
+          else
+            echo ::set-output name=exit_code::1
+          fi
+      - name: Push changes
+        uses: ad-m/github-push-action@master
+        if: steps.commit.outputs.exit_code == 0
+        with:
+          github_token: ${{ secrets.GH_TOKEN }}
+          branch: ${{ github.ref }}
+```
+
+## Why?
+
+Good question indeed!
+
+In fact, you may already noticed JSONResume provides a [hassle-free hosting service to export and collate your resume already](https://jsonresume.org/getting-started/).
+
+However, I made this action because:
+
+1. Using a specific theme that is not supported [requires the JSONResume team to add the theme as dependency to their solutions](https://github.com/jsonresume/registry-functions/issues/7); I wanted to keep the export dependency lean with just the theme I need for my case.
+
+2. This solution allow me to centrally keep a resume in both the JSON format as well as publishing it in HTML as a GitHub page easily.
+
+3. I wanted to learn more about creating and writing Github Actions :robot: