Add install script and update install instructions (#324)

* add install script

* update install instructions

* Update install.sh

Co-Authored-By: Maurizio Branca <m.branca@arduino.cc>

* Update install.sh

Co-Authored-By: per1234 <accounts@perglass.com>

* Update README.md

Co-Authored-By: per1234 <accounts@perglass.com>

Author: masci

.editorconfig

@@ -18,3 +18,7 @@ indent_size = 4
 [*.yml,*.tmpl]
 indent_style = space
 indent_size = 2
+
+[*.sh]
+indent_style = tab
+indent_size = 4