Adding template project and correct name

vendor/rmlui_backend/RmlUi_Vulkan/shader_frag_texture.frag

@@ -0,0 +1,15 @@
+#version 330
+
+#extension GL_ARB_separate_shader_objects : enable
+#extension GL_ARB_shading_language_420pack : enable
+
+layout(set=1, binding=2) uniform sampler2D _tex;
+layout (location = 0) in vec2 fragTexCoord;
+layout (location = 1) in vec4 fragColor;
+
+layout (location = 0) out vec4 finalColor;
+
+void main() {
+	vec4 texColor = texture(_tex, fragTexCoord);
+	finalColor = fragColor * texColor;
+}