add opengl code

Sandbox/assets/shaders/shader.glsl

@@ -0,0 +1,19 @@
+#type vertex
+#version 430 core
+
+layout(location = 0) in vec3 a_Position;
+
+void main()
+{
+	gl_Position = vec4(a_Position, 1.0);
+}
+
+#type fragment
+#version 430 core
+
+layout(location = 0) out vec4 o_Color;
+
+void main()
+{
+	o_Color = vec4(1.0, 0.0, 1.0, 1.0);
+}