Added comment about enabling decorators support to README.md.

Fixes #30.

README.md

@@ -4,6 +4,12 @@ Proposal to add Decorators to ES7, along with a prototype for an ES7 Reflection
 
 * [Detailed proposal][Metadata-Spec]
 
+## Installation
+
+```
+npm install reflect-metadata
+```
+
 ## Background
 
 * Decorators add the ability to augment a class and its members as the class is defined, through a declarative syntax.
@@ -161,6 +167,10 @@ function ParamTypes(...types) {
 }
 ```
 
+* To enable experimental support for metadata decorators in your TypeScript project, you must add `"experimentalDecorators": true` to your tsconfig.json file.
+* To enable experimental support for auto-generated type metadata in your TypeScript project, you must add `"emitDecoratorMetadata": true` to your tsconfig.json file.
+  * Please note that auto-generated type metadata may have issues with circular or forward references for types.
+
 ## Issues
 
 * A poorly written mutating decorator for a class constructor could cause metadata to become lost if the prototype chain is not maintained. Though, not maintaining the prototype chain in a mutating decorator for a class constructor would have other negative side effects as well. @rbuckton