reorganize to use .bat files instead of .sh. Move demo to an example project

assets/shaders/vertex.glsl

@@ -0,0 +1,13 @@
+#version 330 core
+
+layout (location = 0) in vec3 pos;
+out vec3 frag_pos;
+
+uniform mat4 global_t;
+uniform mat4 camera_t;
+uniform mat4 projection_t;
+
+void main() {
+    gl_Position = projection_t * camera_t * global_t * vec4(pos.x, pos.y, pos.z, 1.0);
+    frag_pos = pos;
+}