meta: add stub folder for mie ir builder/optimiser

mie/README

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+METACOMPUTE INSTRUCTION ENGINE
+==============================
+
+Mie is an abstract virtual machine and intermediate representation manipulation
+toolkit. It includes facilities for building, manipulating, and optimising
+intermediate representations of programs, as well as converting IR to/from
+different formats.
+
+The Mie virtual machine features an infinite amount of memory and registers.
+A Mie program can be emitted by a simple front-end compiler that makes use of
+these infinite resources, and Mie's optimisers will convert this program into a
+form that can efficiently use and re-use a more finite set of resources.
+Finally, a Mie backend can convert the program into a concrete implementation
+for a particular system.