feat: README

README.md

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 # Dr_Quine
+
+A **quine** is a program that prints its own source code without reading any
+file. This project implements quines in 3 languages: **C**, **x86-64
+Assembly**, and **Shell**.
+
+The replication logic relies on a string that contains the source code of the
+program itself. When a special placeholder character (`$`) is encountered while
+printing that string, the program switches into *escape mode* and prints the
+string again — this time with special characters escaped — so the output is
+valid source code. Every other character is printed as-is. The result is a
+perfect copy of the original source.
+
+## Programs
+
+- **Colleen** — simple quine, prints its source to stdout
+- **Grace** — writes its source into a new file `Grace_Kid.c`
+- **Sully** — generates and compiles a child program, then runs it, counting
+ down from 5 to 0
+
+> **Warning:** The assembly code in this project does not follow the System V
+> AMD64 ABI — calling conventions, callee-saved/caller-saved registers, and
+> stack alignment are not properly respected. This was my first program in
+> assembly.