Docs: Added notes on CSP-restricted environments to README, see #593

Author: dcodeIO

README.md

@@ -542,6 +542,7 @@ Compatibility
 * Because the internals of this package do not rely on `google/protobuf/descriptor.proto`, options are parsed and presented literally.
 * If typed arrays are not supported by the environment, plain arrays will be used instead.
 * Support for pre-ES5 environments (except IE8) can be achieved by [using a polyfill](https://github.com/dcodeIO/protobuf.js/blob/master/scripts/polyfill.js).
+* Support for [Content Security Policy](https://w3c.github.io/webappsec-csp/)-restricted environments (like Chrome extensions without [unsafe-eval](https://developer.chrome.com/extensions/contentSecurityPolicy#relaxing-eval)) can be achieved by generating and using static code instead.
 * If you need a proper way to work with 64 bit values (uint64, int64 etc.), you can install [long.js](https://github.com/dcodeIO/long.js) alongside this library. All 64 bit numbers will then be returned as a `Long` instance instead of a possibly unsafe JavaScript number ([see](https://github.com/dcodeIO/long.js)).
 
 **License:** [BSD 3-Clause License](https://opensource.org/licenses/BSD-3-Clause)