Add manifest files

Author: natzoz

Commands/providerhub/manifest/_generate.md

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+# [Command] _providerhub manifest generate_
+
+Generates the manifest for the given provider.
+
+## Versions
+
+### [2025-03-01-preview](/Resources/mgmt-plane/L3N1YnNjcmlwdGlvbnMve30vcHJvdmlkZXJzL21pY3Jvc29mdC5wcm92aWRlcmh1Yi9wcm92aWRlcnJlZ2lzdHJhdGlvbnMve30vZ2VuZXJhdGVtYW5pZmVzdA==/2025-03-01-preview.xml) **Stable**
+
+<!-- mgmt-plane /subscriptions/{}/providers/microsoft.providerhub/providerregistrations/{}/generatemanifest 2025-03-01-preview -->
+
+#### examples
+
+- manifest generate
+    ```bash
+        providerhub manifest generate --provider-namespace "{providerNamespace}"
+    ```

Commands/providerhub/manifest/readme.md

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+# [Group] _providerhub manifest_
+
+Manage manifest with providerhub.
+
+## Commands
+
+- [checkin](/Commands/providerhub/manifest/_checkin.md)
+: Checkin the manifest.
+
+- [generate](/Commands/providerhub/manifest/_generate.md)
+: Generates the manifest for the given provider.