Add licence and readme.

.gitignore

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 *.o
-*.toy
+/*.toy
 /coredump*
 toy_cpu

README.md

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+# Koopman TOY CPU Interpreter 
+
+This is a CPU interpreter, based on the specification of Phil Koopmans paper: "Microcoded Versus Hard-wired Control".<br>
+
+##  Build
+
+The project can be built using `make`.
+
+## Usage 
+
+<pre>
+OP_Code 0 (0000b):	   STORE<12 BIT ADDRESS>
+OP_Code 1 (0001b):	   LOAD	<12 BIT ADDRESS>
+OP_Code 2 (0010b):	   JMPZ	<12 BIT ADDRESS>
+OP_Code 3 (0011b):	   ADD	<12 BIT ADDRESS>
+OP_Code 4 (0100b):	   SUB	<12 BIT ADDRESS>
+OP_Code 5 (0101b):	   OR	<12 BIT ADDRESS>
+OP_Code 6 (0110b):	   AND	<12 BIT ADDRESS>
+OP_Code 7 (0111b):	   XOR	<12 BIT ADDRESS>
+OP_Code 8 (1000b):	   NOT	<12 BIT undefined>
+OP_Code 9 (1001b):	   INC	<12 BIT undefined>
+OP_Code 10 (1010b):	   DEC	<12 BIT undefined>
+OP_Code 11 (1011b):	   ZERO	<12 BIT undefined>
+OP_Code 12 (1100b):	   NOP	<12 BIT undefined>
+OP_Code 13 (1101b):	   NOP	<12 BIT undefined>
+OP_Code 14 (1110b):	   NOP	<12 BIT undefined>
+OP_Code 15 (1111b):	   NOP	<12 BIT undefined>
+
+
+
+BIT |15 14 13 12|11 10 9 8 7 6 5 4 3 2 1 0|
+	---------------------------------------
+	|  OP-CODE  |		ADDRESS	          |
+	---------------------------------------
+</pre>
+
+This machine has the following registers:
+
+* 16 BIT Instruction Register (4 BIT OP, 12 BIT Adr)
+* 16 BIT Accumulator
+* 12 BIT Program Counter
+
+Example: 0001000000001010 on RAM position 0 <br>
+0001 means: LOAD the content of ADDRESS 000000001010 into the ACCU
+
+
+## Licence
+
+This program by Michael Krause is licenced under the terms of the GPLv3.
+