Add license and readme files.

Signed-off-by: aixxe <me@aixxe.net>

README.md

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+# cstrike-basehook-linux
+
+Internal project base for Counter-Strike: Source on Linux. Includes full OpenGL ImGui rendering and input handling, a minimal Source SDK implementation, virtual hooking class and various other features for quick prototyping.
+
+### Features
+* Retrieves interfaces directly from the *s_pInterfaceRegs* linked list.
+* ImGui drawing and input handling via *ILauncherMgr* virtual hooks.
+* *IBaseClientDLL::CreateMove* hook with *CUserCmd* checksum validation.
+* *CInput* and *CGlobalVars* pointers retrieved from IBaseClientDLL virtuals.
+* Can easily be unloaded, modified and reloaded without restarting the game.
+
+### Requirements
+
+You will need **cmake**, a relatively up-to-date C++ compiler and 32-bit **SDL2** headers.
+
+If you are on a 64-bit system you may need to enable 32-bit repositories.
+
+```
+pacman -S cmake base-devel lib32-sdl2
+```
+
+### Usage
+
+After you have cloned or extracted an archive of the repository you can use `cmake .` to create a Makefile and `make` to build the shared library. When finished, load the output file into the game while it is running. Using [gdb](https://aixxe.net/2016/09/shared-library-injection) is recommended.
+
+Press <kbd>INSERT</kbd> to toggle the configuration window.
+
+### Credits
+
+Special thanks to [luk1337](https://github.com/luk1337) for the ImGui SDL2 input fix.