Create README.md

Author: rachmari

README.md

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+# Hello world JavaScript action
+
+This action prints "Hello World" to the log or "Hello" + the name of a person to greet.
+
+## Inputs
+
+### `who-to-greet`
+
+**Required** The name of the person to greet. Default `"World"`.
+
+## Outputs
+
+### `time`
+
+The time we greeted you.
+
+## Example usage
+
+```yaml
+uses: actions/hello-world-javascript-action@master
+with:
+  who-to-greet: 'Mona the Octocat'
+```