Adding section to update execution policy

README.md

@@ -3,12 +3,20 @@
 Compile.ps1 repository.
 
 ## Installation
-Copy [compile.ps1](compile.ps1) to your maps directory and unblock the script with ```Unblock-File```:
+First [compile.ps1](compile.ps1) to your maps directory and unblock the script with ```Unblock-File```:
 
 ```powershell
 Unblock-File compile.ps1
 ```
 
+Then open an _Administrative_ powershell prompt and update your powershell execution policy to allow unsigned scripts from remote sources:
+```powershell
+Set-ExecutionPolicy RemoteSigned
+```
+And answer with A:
+
+![Execution Policy](images/execution_policy.png)
+
 ## Usage
 
 ### All-Cores mode