Add info to README

Signed-off-by: d-el <d2.718l@gmail.com>

Author: d-el

README

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+# PS3604LF
+
+### Overview
+This repository include the source code of the front panel Power Supply PS3604L.
+MCU: STM32F407VG.
+
+### Requirements
+toolchain arm-none-eabi 10.3 or higher  
+gcc / g++ 7.5.0 or higher  
+cmake 3.14 or higher  
+libjsoncpp-dev  
+
+### Build project
+>mkdir build  
+>cd build  
+>cmake .. -G "Unix Makefiles" -DCMAKE_TOOLCHAIN_FILE=../toolchain.cmake  
+>make -j8  
+
+#### Start debug server
+>./scripts/gdb-serv.sh openocd-jlink
+
+#### Start debug client
+>./scripts/gdb-client.sh