Rearranaged opcode order

- Rearranaged opcodes to match Iridium's
- Grabbed the get_test_vm() function from the Iridium 1 source to keep up with the tutorial
- Specifications page with details regarding Iridium and Corten's instruction set list

docs/spec.md

@@ -0,0 +1,20 @@
+# Specifications
+
+## Iridium
+
+Corten is based on Fletcher Haynes's [So you want to build a language VM](https://blog.subnetzero.io/post/building-language-vm-part-01/) tutorial. His virtual machine used for the tutorial is known as [Iridium](https://github.com/fhaynes/iridium). Despite it's origins, it does aim to be full a fledged virtual machine and is already on it's [third iteration](https://gitlab.com/fletchercp/iridium3) with support for SSH, PIDs and Strings. Corten aims to be Iridium 1-compatible.
+
+## Instruction Set 
+
+| Register | Opcode |
+| --- | --- |
+| 0 | LOAD |
+| 1 | ADD |
+| 2 | SUB |
+| 3 | MUL |
+| 4 | DIV |
+| 6 | HLT |
+| 5 | JMP |
+| 8 | JMPF |
+| 9 | JMPB |
+| _ | IGL |