Reorg, added more sources

Applications/Official/DEV_FW/source/grnch/sentry_safe/README.md

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+# flipperzero-sentry-safe-plugin
+
+Flipper zero exploiting vulnerability to open any Sentry Safe and Master Lock electronic safe without any pin code.
+
+[Vulnerability described here](https://github.com/H4ckd4ddy/bypass-sentry-safe)
+
+### Installation
+
+- Download [last release fap file](https://github.com/H4ckd4ddy/flipperzero-sentry-safe-plugin/releases/latest)
+- Copy fap file to the apps folder of your flipper SD card
+
+### Usage
+
+- Start "Sentry Safe" plugin
+- Place wires as described on the plugin screen
+- Press enter
+- Open safe
+
+### Build
+
+- Recursively clone your base firmware (official or not)
+- Clone this repository in `applications_user`
+- Build with `./fbt fap_dist APPSRC=applications_user/flipperzero-sentry-safe-plugin`
+- Retreive builed fap in dist subfolders
+
+(More info about build tool [here](https://github.com/flipperdevices/flipperzero-firmware/blob/dev/documentation/fbt.md))