Update README.md

README.md

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-# vw_mmc-tools
+# Volkswagen RNS315/RNS310 mmc_tools
+* Tested on Volkswagen Passat B7 w/ RNS315
+* (might work on other non-VW cars?)
+* Built from Linux sources / Compiled for amd64
+* Should also work on Skoda/Seat/Audi with similar navs
+
+This is a tool that lets you turn Generic SD Card/Samsung EVO card to be recognized by the RNS as a Map Update card.
+You must start with a FAT32 card, containing the navpsf_update folder
+
+#### Usage:
+* Working on Linux 4+ compatible systems
+* Tested on openSUSE Thumbleweed and Ubuntu LTS
+```
+$ git clone https://github.com/TudorGruian/vw_mmc-tools.git
+$ cd vw_mmc-tools
+$ chmod +x mmc
+# and after that you can use ./mmc command, you have to read forums depending on your nav system.
+```