Initial work on using framebuffer from GBuffer

shaders/fragment/render_screen.glsl

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+#version 330 core
+out vec4 FragColor;
+  
+in vec2 outTexCoords;
+
+uniform sampler2D screenTexture;
+
+void main() { 
+  FragColor = texture(screenTexture, outTexCoords);
+}

shaders/vertex/render_screen.glsl

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+#version 330 core
+layout (location = 0) in vec2 inPosition;
+layout (location = 1) in vec2 inTexCoords;
+
+out vec2 outTexCoords;
+
+void main() {
+  gl_Position = vec4(inPosition.x, inPosition.y, inPosition.z, 1.0); 
+  outTexCoords = inTexCoords;
+}