Create INSTALL_linux.md

Support/INSTALL_linux.md

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+# Installation
+
+## Dependencies
+
+Arch Linux:
+```bash
+pacman -Sy mingw-w64-gcc mingw-w64-binutils
+```
+
+## Building
+
+```bash
+git clone https://github.com/galaxyhaxz/devilution
+cd devilution
+cp /path/to/diablo_game_dir/diabloui.dll .
+cp /path/to/diablo_game_dir/storm.dll .
+make
+```
+
+## Install
+
+```bash
+cp devilution.exe /path/to/diablo_game_dir/
+```
+
+## Run
+
+```bash
+wine devilution.exe
+```