Add required files for app catalog

docs/README.md

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+## WiFi Marauder companion app for Flipper Zero
+
+Requires a connected dev board running Marauder FW. See install instructions from UberGuidoZ here: https://github.com/UberGuidoZ/Flipper/tree/main/Wifi_DevBoard#marauder-install-information
+
+## Support
+
+For app feedback, bugs, and feature requests, please create an issue here: https://github.com/0xchocolate/flipperzero-firmware-with-wifi-marauder-companion/issues
+
+You can find me (0xchocolate) on discord as @cococode.
+
+If you'd like to donate to the app development effort:
+**ETH**: `0xf32A1F0CD6122C97d8953183E53cB889cc087C9b`
+**BTC**: `bc1qtw7s25cwdkuaups22yna8sttfxn0usm2f35wc3`
+
+Find more info about Marauder and support its developer (justcallmekoko aka WillStunForFood) here: https://github.com/justcallmekoko/ESP32Marauder
+
+If you found the app preinstalled in a firmware release, consider supporting the maintainers!

docs/changelog.md

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+## v0.4.0
+
+Added Signal Monitor (thanks @justcallmekoko!) to support new sigmon command in Marauder v0.10.5: https://github.com/justcallmekoko/ESP32Marauder/releases
+
+Added keyboard and +5V support from unleashed (thanks @xMasterX!)