docs: standardize README documentation

README.md

@@ -1,2 +1,49 @@
 # terraform-init
-Composite Action for Terraform-Apply
+
+## Description
+
+A GitHub composite action that...
+
+## Features
+
+- Feature 1
+- Feature 2
+
+## Inputs
+
+| Name | Description | Required | Default |
+|------|-------------|----------|----------|
+| `terraform_version` | No description provided | True | `N/A` |
+| `terraform_api` | No description provided | False | `N/A` |
+| `workspace` | No description provided | False | `N/A` |
+| `varfile` | No description provided | False | `N/A` |
+| `init_args` | No description provided | False | `N/A` |
+| `commit_sha` | No description provided | False | `N/A` |
+| `cache_bucket` | No description provided | False | `csvd-dev-ew-github-actions` |
+| `backend_config` | No description provided | False | `''` |
+
+## Outputs
+
+| Name | Description |
+|------|-------------|
+| `commit_sha` | No description provided |
+| `description` | No description provided |
+| `value` | No description provided |
+| `s3_upload_path` | No description provided |
+
+## Usage Examples
+
+```yaml
+jobs:
+  example:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: CSVD/terraform-init@v1
+        with:
+          # Add required inputs here
+```
+
+## Requirements
+
+- List requirements here
+