add correct riscv toolchain. Build takes forever so I'll probably add the binaries later

.gitignore

@@ -1,2 +1,3 @@
 build/
+toolchain/
 *.~lock*

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "riscv-gnu-toolchain"]
+	path = riscv-gnu-toolchain
+	url = https://github.com/riscv-collab/riscv-gnu-toolchain.git

README.md

@@ -17,3 +17,6 @@ Desired features:
 * division
 * instruction and data caches
 * JTAG debug probe
+
+## Installation
+Run `setup.sh` to install GCC

setup.sh

@@ -0,0 +1,7 @@
+sudo apt-get install -y autoconf automake autotools-dev curl python3 libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev libexpat-dev
+
+SCRIPT=$(realpath "$0")
+SCRIPTPATH=$(dirname "$SCRIPT")
+cd $SCRIPTPATH/riscv-gnu-toolchain
+./configure --prefix=$SCRIPTPATH/toolchain/riscv --enable-multilib
+make