Added a global README file

Signed-off-by: Mateusz Nurczyński <[email protected]>

Author: mnurczynski

README.md

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+# microarch
+
+**microarch** is a minimalistic, 8-bit, extensible, RISC, Harvard, load-store computer architecture intended for small low-power (or power constrained) microcontrollers.
+
+It offers 8-bit data address space and up to 16-bit instruction address space, allowing for up to 256 bytes of directly addressable data memory and up to 64kB of directly addressable program memory.
+
+The microarch processor has 8 registers available to the programmer with a powerful, unique register addressing system.
+
+
+##### Navigation
+
+- ```README.md``` - You are here.
+- ```LICENSE``` - License in place for the project.
+- ```microarch-ISA.pdf``` - Full ISA documentation for the architecture.
+- ```base-core/``` - WORK IN PROGRESS: A Verilog design of an example MicroArch core, with a Verilator/SystemC testbench (this part of the project has its own readme file).