add README.txt

README.txt

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+------------------------
+Engineless Any% Speedrun
+------------------------
+
+https://purist.itch.io/engineless-any-percent-speedrun
+
+Contributors/Roles
+==================
+
+- purist
+  * game designer
+  * 2D artist
+  * 3D artist
+  * shader artist
+  * programmer
+
+External assets/systems included in the binary release
+======================================================
+
+- Terminus Font : https://terminus-font.sourceforge.net/
+
+- GLFW : https://www.glfw.org/
+
+- GLAD : https://glad.dav1d.de/
+
+Toolchain
+=========
+
+- GCC : https://gcc.gnu.org/
+  * C++ and C language frontends used
+
+- Make : https://www.gnu.org/software/make/
+  * build system
+
+- GIMP : https://www.gimp.org/
+  * used to create all .png files and most .data files
+
+- Blender : https://www.blender.org/
+  * all 3D models (all .blend and .obj files)
+
+- Emacs : https://www.gnu.org/software/emacs/
+  * used to create all text/source code