Add readme

README.md

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+# SDL Text Input
+
+## What this does
+
+This program allows you to type into a window. Nothing more, nothing less.
+
+## Why?
+
+I started learning C++ and SDL for fun.
+
+## How do I run it?
+
+First, install a C++ compiler (like g++ from gcc), SDL2, SDL2_ttf, make and cmake. 
+
+On Arch Linux, run this command to install everything:
+
+```bash
+sudo pacman -S gcc sdl2 sdl2_ttf make cmake
+```
+
+Next, run:
+
+```bash
+mkdir build && cd build
+cmake ..
+make && ./program
+```
+
+## Credits
+
+### [SDL](https://www.libsdl.org/)
+
+The graphics library I used. Very easy and fun to learn!
+
+### [IBM Plex Mono](https://www.ibm.com/plex/)
+
+The font included in the repository. Probably my favourite monospace font.