Add a newbie guide for people completely new to QMK (#2480)

util/linux_install.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+if grep ID /etc/os-release | grep -q rhel; then
+	# RPM based OS
+	sudo dnf install gcc unzip wget zip dfu-util dfu-programmer avr-gcc \
+	    avr-libc binutils-avr32-linux-gnu arm-none-eabi-gcc-cs \
+	    arm-none-eabi-binutils-cs arm-none-eabi-newlib
+elif grep ID /etc/os-release | grep -q debian; then
+	sudo apt-get update
+	sudo apt-get install gcc unzip wget zip gcc-avr binutils-avr avr-libc \
+	    dfu-programmer dfu-util gcc-arm-none-eabi binutils-arm-none-eabi \
+	    libnewlib-arm-none-eabi
+else
+	echo "Sorry, we don't recognize your OS. Help us by contributing support!"
+	echo
+	echo "    https://docs.qmk.fm/contributing.html"
+fi

util/macos_install.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+if brew --version 2>&1 > /dev/null; then
+	echo "Error! Homebrew not installed or broken!"
+	echo -n "Would you like to install homebrew now? [y/n] "
+	while read ANSWER; do
+		case $ANSWER in
+			y|Y)
+				/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+				break
+			;;
+			n|N)
+				exit 1
+			;;
+			*)
+				echo -n "Would you like to install homebrew now? [y/n] "
+			;;
+                esac
+	done
+fi
+
+brew tap osx-cross/avr
+brew tap PX4/homebrew-px4
+brew update
+brew install avr-gcc gcc-arm-none-eabi dfu-programmer avrdude

util/qmk_install.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+# Pick the correct install script based on the current OS
+
+util_dir=$(dirname "$0")
+
+case $(uname) in
+	Darwin)
+		exec "${util_dir}/macos_install.sh"
+	;;
+	Linux)
+		exec "${util_dir}/linux_install.sh"
+	;;
+	MSYS_NT*)
+		exec "${util_dir}/msys2_install.sh"
+	;;
+esac