Indent nested list in INSTALL.md with 4 spaces
Indent nested list in INSTALL.md with 4 spaces

So it will appear nested in Github. With two spaces there is no
nesting. Also add a newline at the end of the file.

OpenTechStrategies/smoke-alarm-portal,OpenTechStrategies/smoke-alarm-portal,OpenTechStrategies/smoke-alarm-portal,OpenTechStrategies/smoke-alarm-portal