feat: added phong and basic shaders, updated mesh format

assets/shaders/basic.vertex.glsl

@@ -1,14 +1,15 @@
 #version 330 core
-layout (location = 0) in vec3 aPos;
-layout (location = 1) in vec2 aTexCoord;
+layout (location = 0) in vec3 xyz;
+layout (location = 1) in vec2 uv;
+layout (location = 1) in vec2 normal;
 
 uniform mat4 model;
 uniform mat4 view;
 uniform mat4 projection;
 
-out vec2 TexCoord;
+out vec2 tex_coord;
 
 void main() {
-    gl_Position = projection * view * model * vec4(aPos, 1.0);
-    TexCoord = aTexCoord;
+    gl_Position = projection * view * model * vec4(xyz, 1.0);
+    tex_coord = uv;
 }