Add troubleshooting page

[harinikmsft]

trafficstars

Will be useful to add a separate troubleshooting page with instructions on how to restart dev envionment after crashes, installation mistakes, other useful info based on breaking changes etc.,

[chrisglein]

We'll need to gather up content to jumpstart this. There's the Metro troubleshooting page we could use to seed. Could have the script for initializing the tools here. Action is to grab these, create a page, and then start adding content to it over time as people hit issues and we identify common tips.

[chrisglein]

There are two troubleshooting pages today:

• https://microsoft.github.io/react-native-windows/docs/native-modules-troubleshooting
• https://microsoft.github.io/react-native-windows/docs/metro-config-out-tree-platforms

Maybe something with content on the wiki? Only page I spotted was for Metro troubleshooting (so maybe duplicate with the one on the docs)

[chrisglein]

Some content here: #67