Add web edit table readme

src/pages/maps/@id/edit/README.md

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+# Map Editing Interface
+
+Table interface built for quick reconciliation of outside geometries with Macrostrats map representation. 
+
+Features:
+- Hide and Copy columns 
+- Standard Filter and Grouping 
+- Purpose built interfaces for certain columns ( Example: Selection interface for all valid age intervals )
+- View of running operations, as well as push and clear functionality
+- Virtualized 'infinite' scrolling of table data to keep data downloads web friendly
+- Group based auth to prevent outside changes
+-