Add config_memoryinfo.

docs/webui/config_memoryinfo.md

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+##Debugging - Memory Info Entries
+
+This tab displays various memory usage information useful for 
+debugging, it does not have any user configurable options.
+
+####Menu Bar/Buttons
+
+The following functions are available:
+
+Button     | Function
+-----------|---------
+**Help** | Display this help page.
+
+####Grid Items
+
+**Name**
+: Name of the object.
+
+**Size**
+: Current size of the object in bytes.
+
+**Peak size**
+: The largest size the object has reached.
+
+**Count of objects**
+: The current number of objects.
+
+**Peak count of objects**
+: The highest count of objects.
+