added a basic outline of the MTFS protocol

MTFS/README.md

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+# MTFS
+
+MTFS is, in effect, a standardised set of names for function endpoints implementing the [API of an OpenComputers filesystem component](https://ocdoc.cil.li/component:filesystem), over Minitel RPC.
+
+## Function names
+
+Names for filesystem "component" functions should follow the form `fs_<identifier>_<function>`, so, for example, `fs_/usr_isDirectory`.
+
+## Functions
+
+Unless otherwise specified, functions should be inherited from, or implemented to emulate, an [OpenComputers filesystem component](https://ocdoc.cil.li/component:filesystem). More specifically:
+
+- spaceUsed
+- seek
+- makeDirectory
+- exists
+- isReadOnly
+- write
+- spaceTotal
+- isDirectory
+- rename
+- list
+- lastModified
+- getLabel
+- setLabel
+- remove
+- size
+- open
+- read
+- write
+- close
+
+### Optional extensions
+
+#### dirstat
+
+An optional extra function, `dirstat`, may be implemented on the server side to allow clients to access directory listings with less RPC calls; it should return data in a Lua table of the following structure:
+
+```
+{
+ [filename: string] = {isDirectory: boolean, size: boolean, lastModified: number},
+ ...
+}
+```