added imgui to the template

source/shader/fragment.glsl

@@ -0,0 +1,8 @@
+#version 330 core
+out vec4 FragColor;
+
+void main() {
+    FragColor = vec4(1.0, 1.0, 1.0, 1.0);
+}
+
+

source/shader/vertex.glsl

@@ -0,0 +1,9 @@
+#version 330 core
+layout (location = 0) in vec2 aPos;
+
+out vec3 vColor;
+
+void main() {
+    gl_Position = vec4(aPos, 0.0, 1.0);
+}
+