Readme: include a quick start section, describe directory outline

Makefile

@@ -78,8 +78,7 @@ qemu: kern/kernel.elf
 	@$(QEMU) -machine virt -bios none -nographic -m 128M -smp 4 -kernel $<
 
 clean:
-	rm -f *.o *.elf *.d lib/*.o lib/*.d
-	find . -type f -name '*.[od]' -exec rm -f {} +
+	find . -type f -name '*.[od(elf)]' -exec rm -f {} +
 
 format:
 	find . -type f -name '*.[ch]' -exec clang-format -i {} +

README.md

@@ -7,7 +7,34 @@ For a quick reference on RISC-V assembly:
 
 Some low-level string format routines borrowed from [mini-printf](https://github.com/mludvig/mini-printf)
 
-Toolchains:
+### Directory outline
+
+The planned directory outline is as follows:
+```
+root
+├── kern           # General kernel sources
+│   ├── libkern    # Kernel specific library routines
+│   ├── memory     # Memory related code (kalloc, buddy and friends)
+│   └── arch       # Architecture specific functionality
+├── libc           # Userspace C library
+└── user           # Userspace programs
+```
+
+### Quick Start
+
+```sh
+make get_toolchain # Dont worry, is will land locally inside project directory
+make -j$(nproc)
+make qemu
+```
+
+The project can be cleaned with:
+```sh
+make clean     # Wipes .o, .d, .elf
+make distclean # Wipes the above, but also removes toolchain
+```
+
+### Toolchains:
 - https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack
 - https://github.com/xpack-dev-tools/qemu-riscv-xpack/
 
@@ -17,6 +44,8 @@ Toolchains:
 > term trap, largely because it was the term used by the PDP11/40 and therefore is the
 > conventional Unix term.
 
+### Notes/Misc
+
 | Register    | Name                       | Privilege Level | Description                                                                 |
 |-------------|----------------------------|------------------|-----------------------------------------------------------------------------|
 | `mstatus`   | Machine Status Register    | Machine          | Holds global interrupt enable, previous privilege mode, etc.                |
@@ -35,9 +64,7 @@ Toolchains:
 | `mip`       | Machine Interrupt Pending  | Machine           | Indicates pending interrupts.                                               |
 | `mie`       | Machine Interrupt Enable   | Machine           | Controls which interrupts are enabled.                                      |
 
-# Notes
-
-## Libc Implementations
+### Libc Implementations
 
 [uClibc](https://uclibc.org/)
 [musl libc](https://musl.libc.org/)