Add more details in README

Author: sanket-deepsource

README.md

@@ -2,7 +2,31 @@
 
 [![DeepSource](https://static.deepsource.io/deepsource-badge-light-mini.svg)](https://deepsource.io/gh/deepsourcelabs/test-coverage-action/?ref=repository-badge)
 
-GitHub Action that enables you to upload your test coverage data to DeepSource easily.
+GitHub Action that enables you to upload your test coverage data to DeepSource easily. You must have the [Test Coverage](https://deepsource.io/docs/analyzer/test-coverage.html) analyzer enabled on your repository for reporting to work. Please refer to the [.deepsource.toml configuration reference](https://deepsource.io/docs/config/deepsource-toml.html#analyzers) for details.
+
+If you're not using DeepSource yet, [get started for free](https://deepsource.io/signup).
+
+
+## Usage
+
+This Action assumes that the coverage file has already been generated after the tests have run. To integrate it in your workflow, define a step which refers to this Action in your `workflow.yml` file. We recommend that you use `@master`as the ref.
+
+```yaml
+steps:
+  - name: Report test coverage to DeepSource
+    uses: deepsourcelabs/test-coverage-action@master
+    with:
+      key: python
+      coverage-file: coverage.xml
+      dsn: ${{ secrets.DEEPSOURCE_DSN }}
+```
+
+The possible inputs to this action are:
+
+* `key` (string, **required**): Programming language shortcode for which coverage is reported. Allowed values are: `python`, `go`.
+* `coverage-file` (string, **required**): Path to the coverage data file. e. g. `coverage.xml`
+* `dsn` (string, **required**): DeepSource DSN of this repository. It is available under **Settings → Reporting tab** of the repository page on DeepSource.
+* `fail-ci-on-error` (boolean): Should the CI build fail if there is an error while uploading the report to DeepSource? Allowed values are: `true`, `false`. This is set to `false` by default.
 
 ## License