feat: added phong and basic shaders, updated mesh format

assets/shaders/basic.fragment.glsl

@@ -1,10 +1,10 @@
 #version 330 core
-out vec4 FragColor;
+out vec4 frag_color;
 
-uniform sampler2D ourTexture;
+uniform sampler2D texture;
 
-in vec2 TexCoord;
+in vec2 uv;
 
 void main() {
-    FragColor = texture(ourTexture, TexCoord);
+    frag_color = texture(texture, uv);
 };