Update README.md

README.md

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 walnut
 ======
 
-An opinionated, constrained, secure application framework with a hard shell - like iOS, but for a home server.
+An opinionated, constrained, secure application framework with a hard shell - kinda like iOS, but for a server.
+
+Applications are written in express, but instead of using `require` for generic packages,
+they use `req.getSiteCapability(pkg)` and are restricted to packages that have been
+allowed by app, device, site, or user permission. Any configuration for the capability
+(external passwords, api keys, etc) will be set up beforehand so that they are not exposed
+to the application.
 
 Security Features
 -----------------