Install script easy button (synadia-io#105)

* install script easy button
* create scripts/ directory

Author: jordan-rash

Diff for: _scripts/install.sh

@@ -0,0 +1,90 @@
+#!/bin/sh
+
+set -e
+
+command -v jq >/dev/null 2>&1 || {
+	echo "Please install jq"
+	exit 1
+}
+
+get_version() {
+	echo $(
+		command curl -L -s \
+			-H "Accept: application/vnd.github+json" \
+			-H "X-GitHub-Api-Version: 2022-11-28" \
+			https://api.github.com/repos/synadia-io/nex/releases/latest |
+			command jq -r '.name'
+	)
+}
+
+get_arch() {
+	a=$(uname -m)
+	case ${a} in
+	"x86_64" | "amd64")
+		echo "amd64"
+		;;
+	"i386" | "i486" | "i586")
+		echo "386"
+		;;
+	"aarch64" | "arm64" | "arm")
+		echo "arm64"
+		;;
+	"mips64el")
+		echo "mips64el"
+		;;
+	"mips64")
+		echo "mips64"
+		;;
+	"mips")
+		echo "mips"
+		;;
+	*)
+		echo ${NIL}
+		;;
+	esac
+}
+
+get_os() {
+	echo $(uname -s | awk '{print tolower($0)}')
+}
+
+echo "
+  	   ▐ ▄ ▄▄▄ .▐▄• ▄ 
+	  •█▌▐█▀▄.▀· █▌█▌▪
+	  ▐█▐▐▌▐▀▀▪▄ ·██· 
+	  ██▐█▌▐█▄▄▌▪▐█·█▌
+	  ▀▀ █▪ ▀▀▀ •▀▀ ▀▀
+"
+
+os=$(get_os)
+arch=$(get_arch)
+binary_version=$(get_version)
+file_name="nex_${binary_version}_${os}_${arch}"
+asset_uri="https://github.com/synadia-io/nex/releases/download/${binary_version}/${file_name}"
+
+downloadFolder="${TMPDIR:-/tmp}"
+mkdir -p ${downloadFolder}
+downloaded_file="${downloadFolder}/nex"
+executable_folder="/usr/local/bin"
+
+echo "[1/3] Download ${asset_uri} to ${downloadFolder}"
+rm -f ${downloaded_file}
+curl --silent --fail --location --output "${downloaded_file}" "${asset_uri}"
+
+echo "[2/3] Install nex to ${executable_folder}"
+mv ${downloaded_file} ${executable_folder}
+exe=${executable_folder}/nex
+chmod +x ${exe}
+
+echo "[3/3] Check environment variables"
+echo ""
+echo "nex was installed successfully to ${exe}"
+if command -v nex --version >/dev/null; then
+	echo "Run 'nex --help' to get started"
+else
+	echo "Manually add the directory to your \$HOME/.bash_profile (or similar)"
+	echo "  export PATH=${executable_folder}:\$PATH"
+	echo "Run '$exe_name --help' to get started"
+fi
+
+exit 0