Update readme.md

**Diagrams for 33.127**

## Diagrams for 33.127

Here are the diagrams of [TS 33.127](TS 33.127)

The file names used for the diagrams are the figure numbers, e.g. Figure_5.2-1.vsdx. Inside the visio file, the page name represents the TS version number, e.g. 18.2.0. When a new CR is submitted that changes the figure, a new page can be inserted with the modified figure with the new version number of the TS. Once the CR is agreed, the figure with the earlier version is to be deleted. 

The file names used for the diagrams are the figure numbers, e.g. Figure_5.2-1.vsdx. Inside the visio file, the page name represents the TS version number, e.g. 18.2.0. When a new CR is submitted that changes the figure, a new page can be inserted with the modified figure with the new version number of the TS. Once the CR is agreed, the figure with the earlier version can be deleted.