Add Ehwrj clean-room live map

artifacts/ehwrj-win-x64/RUNNING.txt

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+Ehwrj portable Windows x64 build
+
+1. Start War Thunder.
+2. Confirm the local map is available at http://127.0.0.1:8111/map_info.json.
+3. Run Ehwrj.exe.
+4. Use "Show overlay" in the left panel to enable the click-through overlay.
+
+Network scope:
+- Ehwrj only reads the loopback War Thunder local API.
+- It does not contact external hosts.
+
+Settings:
+- Saved under %LOCALAPPDATA%\Ehwrj\settings.json.