Create msys2_win.md

docs/msys2_win.md

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+# Compiling hashcat with msys2.
+
+Tested on a Windows 7 SP1 x64 machine.
+
+Go to https://www.msys2.org/ and follow the instructions on the main page (steps 1 to 7).
+
+Install additional dependencies required to compile hashcat by running the following commands:
+```sh
+$ pacman -S git
+$ pacman -S make
+$ pacman -S gcc
+$ pacman -S libiconv-devel
+```
+
+Once all that is done, type the following command to copy the latest master revision of hashcat repository into msys64\home\username\hashcat
+```sh
+$ git clone https://github.com/hashcat/hashcat.git
+```
+
+Switch to the newly created folder by runnig
+```sh
+$ cd hashcat
+```
+
+Now type "make" to start compiling hashcat
+```sh
+$ make
+```
+
+The process may take a while, please be patient.
+Once it's finished, run hashcat by typing "./hashcat.exe".
+```sh
+$ ./hashcat.exe
+```
+
+While hashcat will run fine from msys shell, running it from a windows shell will require msys-iconv-2.dll and msys-2.0.dll to be in the same folder with hashcat.exe (the files can be found in msys64\usr\bin).