docs: add real application screenshots (#25)

Author: Codewriter90x

README.md

@@ -41,6 +41,16 @@ automatically tested hit-matching core.
 The same gameplay session powers Play and Learn. Charts, the DSP song clock,
 hit matching and MIDI input are shared rather than reimplemented per mode.
 
+## See it in action
+
+These are real captures of the current Unity application running the original,
+rights-clean demo content—not promotional mockups.
+
+| Main menu | Concert Stage gameplay |
+| --- | --- |
+| [![HitTheKit main menu with Play, Learn and electronic-drum setup](website/assets/images/screenshots/main-menu.jpg)](website/assets/images/screenshots/main-menu.jpg) | [![HitTheKit Concert Stage gameplay with the perspective drum highway and countdown](website/assets/images/screenshots/gameplay-concert-stage.jpg)](website/assets/images/screenshots/gameplay-concert-stage.jpg) |
+| Choose Play, Learn or configure an electronic drum kit. | Follow the perspective highway using a keyboard or a supported CoreMIDI kit. |
+
 ## Project status
 
 > [!IMPORTANT]

docs/legal/ASSET_PROVENANCE.md

@@ -45,6 +45,19 @@ The tracked `HitTheKit-MainMenuStage.fbx` is project-owned procedural geometry
 created for the menu scene. Website scene images, the FBX, older variants, and
 design evidence are individually hashed in the machine-readable inventory.
 
+## First-party application captures
+
+These screenshots were captured directly from the HitTheKit Unity application
+using only project-owned interface, environment and synthetic demo content.
+They contain no commercial song, recording, chart, artwork or performer
+likeness. The JPEG files are publication derivatives of the original PNG
+captures retained in the private development archive.
+
+| Asset | SHA-256 | Purpose |
+| --- | --- | --- |
+| `website/assets/images/screenshots/main-menu.jpg` | `7f00a1b51d05b327c279f0bf199b646bc9899dac5b76a798d0932f7d0e41338a` | README application preview: main menu |
+| `website/assets/images/screenshots/gameplay-concert-stage.jpg` | `246771f958d41adc02cf7ef15533ea977f9d0a35676bd9c9edf197eec37f510d` | README application preview: synthetic Concert Stage gameplay |
+
 ## Programmatically generated branding
 
 `branding/app-icon/master/HitTheKit-Icon-Source-1254.png` has SHA-256

docs/legal/ASSET_PROVENANCE.sha256

@@ -61,3 +61,5 @@ aeb85dcd4d2146f541a20b059d0202b4b74e26d36bb0c4d6a69e3216b53d32b3  website/assets
 8d5610553900157921047bbe8c4ea4ccc02c6e0f925041dc3f9be831e09994c8  website/assets/images/hitthekit-social-preview.jpg
 3fbf9e18624c5e3df571b58b92ec8639a21120db3d740e2a4f11ac534f1fdcae  website/assets/images/logo-original.png
 5fdcf113362ecd258997910feffbafc3c367b78008c0ecf9daf2b134c91cdee2  website/assets/images/stage-command.jpg
+246771f958d41adc02cf7ef15533ea977f9d0a35676bd9c9edf197eec37f510d  website/assets/images/screenshots/gameplay-concert-stage.jpg
+7f00a1b51d05b327c279f0bf199b646bc9899dac5b76a798d0932f7d0e41338a  website/assets/images/screenshots/main-menu.jpg