Add License, ignore build directory

.gitignore

@@ -1,3 +1,5 @@
+build/
+
 ### C ###
 # Prerequisites
 *.d

LICENSE

@@ -0,0 +1,22 @@
+MIT License
+
+Copyright (c) 2023 Felix Suchert
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

README.md

@@ -4,7 +4,13 @@ This repository houses my own implementation of Tetris. _Why?_ To learn a bit of
 
 ## Building
 
-TODO
+You need [GLFW](https://www.glfw.org) to build this project, as well as OpenGL 4.1. Compile the project using CMake:
+
+```
+cmake -S . -B build
+cmake --build build
+build/Tetris
+```
 
 ## Generating glad files
 
@@ -16,4 +22,4 @@ glad --out-path . --api gl:core=4.1 c
 
 ## License
 
-This work is licensed under the GNU Lesser General Public License v3. See [LICENSE](./LICENSE) for details.
+This work is licensed under the MIR license. See [LICENSE](./LICENSE) for details.