* Add aside about using only one corestore instance per application
A single corestore instance covers all needs and avoids pitfalls (such
as file locks and named hypercores not being the same key) that come
from multiple corestore instances.
* Add note for best practice to create one hyperswarm instance per app
* Create a best practices guide for Pear Application development
* Add "Best Practices" article to SUMMARY.md & README.md
* Include points added to the guides on using single swarm & store
* Fix capitalization in Best Practices article
