feat: add imgui library & primitive shapes

res/render/primitives/cube.vert

@@ -0,0 +1,22 @@
+#version 330 core
+
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aNormal;
+layout (location = 2) in vec2 aTexCoords;
+
+uniform mat4 projection;
+uniform mat4 model;
+uniform mat4 view;
+
+out vec3 Normal;
+out vec3 FragPos;
+out vec2 TexCoords;
+
+void main()
+{
+  FragPos = vec3(model*vec4(aPos , 1.0));
+  gl_Position = projection*view*vec4(FragPos , 1.0);
+
+  Normal = mat3(transpose(inverse(model)))*aNormal;
+  TexCoords = aTexCoords;
+}