adding gfx and ui stuff

gfx/assets/shaders/text.fragment.glsl

@@ -0,0 +1,11 @@
+#version 330 core
+out vec4 pixel_color;
+
+in vec4 frag_color;
+in vec2 frag_uv_position;
+
+uniform sampler2D glyph_atlas;
+
+void main() {
+    pixel_color = vec4(frag_color.xyz,texture(glyph_atlas, frag_uv_position).r);
+};