Update start_locations.json

This is my first time really doing something on github, sorry if I ignore some etiquette or something. 

I add lmoe-shelter to the starting-locations. 
Adding other locations is somewhat hard, as when they are not available it won't let you start there (obviously). 
LMOE-Shelters have been available on every single test I tried, so I assume it is safe to add them.