Added text overlay class to base folder

data/shaders/base/generate-spirv.bat

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+glslangvalidator -V textoverlay.vert -o textoverlay.vert.spv
+glslangvalidator -V textoverlay.frag -o textoverlay.frag.spv

data/shaders/base/textoverlay.frag

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+#version 450 core
+
+layout (location = 0) in vec2 inUV;
+
+layout (binding = 0) uniform sampler2D samplerFont;
+
+layout (location = 0) out vec4 outFragColor;
+
+void main(void)
+{
+	float color = texture(samplerFont, inUV).r;
+	outFragColor = vec4(vec3(color), 1.0);
+}

data/shaders/base/textoverlay.vert

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+#version 450 core
+
+layout (location = 0) in vec2 inPos;
+layout (location = 1) in vec2 inUV;
+
+layout (location = 0) out vec2 outUV;
+
+out gl_PerVertex 
+{
+    vec4 gl_Position;   
+};
+
+void main(void)
+{
+	gl_Position = vec4(inPos, 0.0, 1.0);
+	outUV = inUV;
+}