Added details about payload flashing

FlashingScript/README.md

@@ -5,3 +5,12 @@ Currently the script is written for Windows. ~~Script for macOS and Linux distro
 
 ## about fb2.exe
 This is specially made fastboot.exe included in OST LA, it will indicate your projectcode correctly.
+
+## about what you need for payload.bin / unpacked payload flashing ability
+
+For Windows, in my case you'll need these files:
+img2simg.exe and required DLLs, in my case:
+cyggcc_s-1.dll, cygwin1.dll, cygz.dll
+
+And you'll need to install Python 3.
+Hopefully this can be ported to macOS / Linux soon.