readme: Add readme instructions

README.md

@@ -8,6 +8,7 @@ Toolbox allows you to perform admin operations on [DataGalaxy](https://www.datag
 - **Copy attributes** from a source client space to a target client space.
 - **Delete attributes** on client space.
 - **Copy technologies** from a source client space to a target client space.
+- **Copy screens** from a source client space or workspace to a target client space or workspace.
 - **Copy glossary** properties from a workspace to another.
 - **Copy dictionary** objects from a workspace to another.
 - **Copy dataprocessings** from a workspace to another.
@@ -58,6 +59,23 @@ datagalaxy-toolbox.exe copy-attributes [-h] --url-source URL_SOURCE --url-target
 datagalaxy-toolbox.exe copy-technologies [-h] --url-source URL_SOURCE --url-target URL_TARGET --token-source TOKEN_SOURCE --token-target TOKEN_TARGET
 ```
 
+#### copy-screens
+
+```
+datagalaxy-toolbox.exe copy-screens [-h] --url-source URL_SOURCE [--url-target URL_TARGET] --token-source TOKEN_SOURCE [--token-target TOKEN_TARGET] [--workspace-source WORKSPACE_SOURCE] [--workspace-target WORKSPACE_TARGET]
+```
+ `--url-target` and `--token-target` are optional if the copy is made on the same client space.
+
+ `--workspace-source` is optional if the copy is made from a client space.
+
+ `--workspace-target` is optional if the copy is made to a client space.
+
+ 4 scenarios are possible:
+  - Copy screens from a client space to another client space (different client spaces)
+  - Copy screens from a workspace to a client space (can be on the same client space or not)
+  - Copy screens from a client space to a workspace (can be on the same client space or not)
+  - Copy screens from a workspace to another workspace (can be on the same client space or not)
+
 #### copy-glossary
 
 ```