docs: Update README.md with target_platform input documentation

Author: taj54

README.md

@@ -26,6 +26,23 @@ To use this action in your workflow, add the following step:
 | -------------- | -------------------------------------------------- | ------- |
 | `release_type` | Select the version bump type (patch, minor, major) | `patch` |
 | `git_tag`      | Whether to create a Git tag after bump             | `true`  |
+| `target_platform` | Explicitly specify the platform to update (e.g., `node`, `python`). If not provided, the platform will be detected automatically. | `''`    |
+
+### Explicit Platform Targeting (`target_platform`)
+
+By default, the action automatically detects the project's platform based on common manifest files (e.g., `package.json` for Node.js, `pyproject.toml` for Python). However, in certain scenarios, such as monorepos or projects with multiple potential manifest files, you might want to explicitly control which platform's version is bumped.
+
+The `target_platform` input allows you to specify the exact platform (e.g., `node`, `python`, `docker`, `go`, `php`, `rust`) you intend to update. When this input is provided, the action will bypass its automatic detection and directly attempt to update the version for the specified platform.
+
+**Example:**
+
+```yaml
+- name: Bump Node.js version
+  uses: taj54/[email protected]
+  with:
+    release_type: 'patch'
+    target_platform: 'node' # Explicitly target Node.js
+```
 
 ## Outputs
 

tests/services/updaterService.test.ts

@@ -36,7 +36,7 @@ describe('UpdaterService', () => {
       mockNodeUpdater.canHandle.mockReturnValue(false);
       mockPythonUpdater.canHandle.mockReturnValue(true);
 
-      expect(updaterService.detectPlatform()).toBe('python');
+      expect(updaterService.getPlatform()).toBe('python');
       expect(mockNodeUpdater.canHandle).toHaveBeenCalled();
       expect(mockPythonUpdater.canHandle).toHaveBeenCalled();
     });
@@ -45,8 +45,8 @@ describe('UpdaterService', () => {
       mockNodeUpdater.canHandle.mockReturnValue(false);
       mockPythonUpdater.canHandle.mockReturnValue(false);
 
-      expect(() => updaterService.detectPlatform()).toThrow(PlatformDetectionError);
-      expect(() => updaterService.detectPlatform()).toThrow('Could not detect platform.');
+      expect(() => updaterService.getPlatform()).toThrow(PlatformDetectionError);
+      expect(() => updaterService.getPlatform()).toThrow('Could not detect platform.');
     });
   });