Add README.md, LICENSE

LICENSE

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+MIT License
+
+Copyright (c) 2020 Stephen Seo
+
+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

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+# Triangles
+
+THIS PROJECT IS STILL A WORK IN PROGRESS!
+
+A gui application that lets you draw triangles of different colors on a colored
+background.
+
+Uses [imgui](https://github.com/ocornut/imgui) for UI.
+
+# Compiling
+
+Create a build dir, run cmake, and then make to build.
+
+    mkdir buildDebug
+    cd buildDebug
+    cmake ..
+    make
+
+## Dependencies
+
+SFML should be installed on the system. imgui, and imgui-sfml are git submodules
+and should be initialized with `git submodule update --init --recursive`.