feat: beta compiling to fasm (codegen) + hello world example let's goooo

hello.asm

@@ -0,0 +1,35 @@
+format ELF64
+
+section '.text' executable
+
+extrn 'putchar' as __putchar
+putchar = PLT __putchar
+
+public main
+
+main:
+    ; allocate space for locals (a and b: 4 bytes each → 8 bytes total)
+    push rbp
+    mov rbp, rsp
+    sub rsp, 8
+
+    ; local a = 34  → stored at [rbp - 4]
+    mov dword [rbp - 4], 34
+
+    ; local b = 35  → stored at [rbp - 8]
+    mov dword [rbp - 8], 35
+
+    ; compute a + b
+    mov eax, [rbp - 4]
+    add eax, [rbp - 8]
+
+    ; call putchar(a + b)
+    ; SysV: first integer arg → EDI
+    mov edi, eax
+    call putchar
+
+    ; return 0 from main
+    mov eax, 0
+
+    leave
+    ret