move shaders to separate directory

shader/instancing_fragment.glsl

@@ -0,0 +1,8 @@
+#version 330
+
+uniform vec4 colDiffuse;
+out vec4 finalColor;
+
+void main() {
+    finalColor = colDiffuse;
+}

shader/instancing_vertex.glsl

@@ -0,0 +1,13 @@
+#version 330
+
+in vec3 vertexPosition;
+in vec2 vertexTexCoord;
+in vec3 vertexNormal;
+in vec4 vertexColor;
+in mat4 instanceTransform;
+
+uniform mat4 mvp;
+
+void main() {
+    gl_Position = mvp * instanceTransform * vec4(vertexPosition, 1.0);
+}