add first clone convenience script

scripts/first-clone-setup-fast.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+
+set -ex
+
+{
+
+export MAKEFLAGS=-j16
+
+STARTDIR=$(git rev-parse --show-toplevel)
+
+./build-setup.sh riscv-tools -f
+source env.sh
+
+./scripts/firesim-setup.sh
+cd sims/firesim
+source sourceme-f1-manager.sh --skip-ssh-setup
+
+cd sim
+unset MAKEFLAGS
+make f1
+export MAKEFLAGS=-j16
+
+cd $STARTDIR/software/firemarshal
+./init-submodules.sh
+marshal -v build br-base.json
+
+cd $STARTDIR
+./scripts/repo-clean.sh
+
+} 2>&1 | tee first-clone-setup-fast-log