doc: README.md

README.md

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+# pxasme
+
+A single-pass x86_64 assembler that emits relocatable ELF64 objects.
+
+## Usage
+
+```bash
+pxasme -Src myapp.asm -Dest myapp.o
+ld -s -o myapp myapp.o
+./myapp
+```
+
+## Status
+
+- [X] Lexer
+	- [X] "Variables" in data/rodata (u8, u16, u32, u64, sz)
+		- [X] C-style addressing (bare or `&`)
+	- [ ] Unified public/private, import/export syntax
+	- [X] State machine parser for opcode arguments	
+- [X] Parser
+	- [X] mov, ret, syscall, sections, variables
+	- [X] strlen($var) compile-time function
+	- [ ] more isa ops
+- [X] Code generation
+	- [X] Generate ELF64 binaries
+		- [X] Relocations
+			- [X] `R_X86_64_32S` (n.b. not PIC)
+			- [X] `R_X86_64_64`
+	- [ ] Freestanding mode