Hello everyone I am not so experienced with graphics in Unity, can anyone please help.
How can I make mesh visible from both sides? The mesh is just a plane. Thanks
Here some screenshots:
If look from upper side

If look under the iron net.

Here is a shader I use just one of the standart.
Transparent/Cutout/Diffuse Shader
Shader “Transparent/Cutout/DiffuseCullOff” {
Properties {
_Color (“Main Color”, Color) = (1,1,1,1)
_MainTex (“Base (RGB) Trans (A)”, 2D) = “white” {}
_Cutoff (“Alpha cutoff”, Range(0,1)) = 0.5
}
SubShader {
Tags {"Queue"="AlphaTest" "IgnoreProjector"="True" "RenderType"="TransparentCutout"}
LOD 200
Cull Off
CGPROGRAM
#pragma surface surf Lambert alphatest:_Cutoff
sampler2D _MainTex;
fixed4 _Color;
struct Input {
float2 uv_MainTex;
};
void surf (Input IN, inout SurfaceOutput o) {
fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
o.Albedo = c.rgb;
o.Alpha = c.a;
}
ENDCG
}
Fallback "Transparent/Cutout/VertexLit"
}
The “Cull” function in a shader can be used to stop backwards facing faces from being rendered as it usually good for optimisation, but changing it to Cull Off it will render both sides 
Just save this as a shader and apply this one to the material