Add README screenshots

Six screenshots under media/screenshots/, each embedded in the
README next to the section it illustrates:

- overview.png — full UI hero shot under the title
- command-completion.png + variable-completion.png — Authoring
- run-live.png + test-explorer.png — Running
- templates.png — Templates

Author: azizbecha

README.md

@@ -2,6 +2,8 @@
 
 Author, run, and inspect [agent-device](https://incubator.callstack.com/agent-device) `.ad` scripts inside VS Code — Vitest-style.
 
+![Agent Device for VS Code — overview](media/screenshots/overview.png)
+
 ## Features
 
 ### Authoring
@@ -12,6 +14,10 @@ Author, run, and inspect [agent-device](https://incubator.callstack.com/agent-de
 - **Platform value completion + diagnostic** — suggests `android` / `ios` after `--platform` and `context platform=`, errors on anything else
 - **Hover** docs for commands, directives, and flags
 
+![Command completion](media/screenshots/command-completion.png)
+
+![Variable completion in ${...}](media/screenshots/variable-completion.png)
+
 ### Running
 
 - **Run Output panel** in the bottom panel container — opens to a workspace-wide `.ad` file picker; click any file to run
@@ -22,10 +28,16 @@ Author, run, and inspect [agent-device](https://incubator.callstack.com/agent-de
 - **Native gutter test icons** — every action line is a child `TestItem` with a `range`, so the editor gutter shows pass/fail icons after each run
 - **Test Explorer integration** — every `.ad` file appears as a `TestItem`; runs from any entry point (panel, CodeLens, palette, native test gutter) all reflect the same state in the Testing view
 
+![Live per-step run with the Test Results streaming](media/screenshots/run-live.png)
+
+![Test Explorer with passed steps and the Run Output panel](media/screenshots/test-explorer.png)
+
 ### Templates
 
 - `+ New` opens a QuickPick with 9 starter templates: empty file, iOS/Android Settings smoke, login flow, search & assert, scroll & discover, swipe gestures, visual baseline, React Native (Metro)
 
+![Template picker](media/screenshots/templates.png)
+
 ### Devices
 
 - **Devices view** lists every iOS simulator and Android AVD, grouped by platform, booted entries first