Add README

README.md

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+# Jitfuck
+
+A (very limited) JIT compiler for
+[brainfuck](https://en.wikipedia.org/wiki/Brainfuck), written in
+x86_64 assembly.
+
+To build (with [fasm](https://flatassembler.net/)):
+
+```
+fasm jitfuck.asm
+```
+
+It reads code from `stdin`:
+
+```
+./jitfuck < hello.bf
+```