How to add light maps to a custom Rflection shader

I am a total beginner when it comes to shaders\Programing in unity and i need this shader to recive lightmaps since it is for a mobile game project :| i want to have a floor reflection but it needs to look nice too with the light maps! And since i can't find anything about it on the damn google o.O i wanted to ask here for help !

This is the shader :

Shader "Mobile/PlanarReflection" { Properties { _MainAlpha("MainAlpha", Range(0, 1)) = 1 _ReflectionAlpha("ReflectionAlpha", Range(0, 1)) = 1 _MainTex ("MainTex (RGBA)", 2D) = "" [HideInInspector]_ReflectionTex ("ReflectionTex", 2D) = "white" { TexGen ObjectLinear } }

 Subshader
 {

     CGPROGRAM
     #pragma surface surf Lambert

     float _MainAlpha;
     float _ReflectionAlpha;
     sampler2D _MainTex;
     sampler2D _ReflectionTex;

     struct Input
     {
         float2 uv_MainTex;
         float4 screenPos;
     };

     void surf(Input IN, inout SurfaceOutput o)
     {

         fixed4 main_Tex = tex2D(_MainTex, IN.uv_MainTex);

         o.Albedo =  main_Tex.rgb  * _MainAlpha;

         o.Emission = tex2D(_ReflectionTex, IN.screenPos.xy / IN.screenPos.w).rgb * _ReflectionAlpha * main_Tex.a;

     }
     ENDCG
     }

 Fallback "Diffuse"

}