docs(@angular-devkit/core): add JSON schema headers

Author: filipesilva

.monorepo.json

@@ -58,6 +58,12 @@
     },
     "@angular-devkit/core": {
       "name": "Core",
+      "links": [
+        {
+          "label": "README",
+          "url": "https://github.com/angular/devkit/blob/master/packages/angular_devkit/core/README.md"
+        }
+      ],
       "version": "0.0.23",
       "hash": "45c3c8b7d60b038bbedd3000ebca1b88"
     },

README.md

@@ -51,7 +51,7 @@ This is a monorepo which contains many packages:
 | Project | Package | Version | Links |
 |---|---|---|---|
 **Build Optimizer** | [`@angular-devkit/build-optimizer`](http://npmjs.com/packages/@angular-devkit/build-optimizer) | [![latest](https://img.shields.io/npm/v/%40angular-devkit%2Fbuild-optimizer/latest.svg)](http://npmjs.com/packages/@angular-devkit/build-optimizer) | [![README](https://img.shields.io/badge/README--green.svg)](https://github.com/angular/devkit/blob/master/packages/angular_devkit/build_optimizer/README.md)
-**Core** | [`@angular-devkit/core`](http://npmjs.com/packages/@angular-devkit/core) | [![latest](https://img.shields.io/npm/v/%40angular-devkit%2Fcore/latest.svg)](http://npmjs.com/packages/@angular-devkit/core) | 
+**Core** | [`@angular-devkit/core`](http://npmjs.com/packages/@angular-devkit/core) | [![latest](https://img.shields.io/npm/v/%40angular-devkit%2Fcore/latest.svg)](http://npmjs.com/packages/@angular-devkit/core) | [![README](https://img.shields.io/badge/README--green.svg)](https://github.com/angular/devkit/blob/master/packages/angular_devkit/core/README.md)
 **Schematics** | [`@angular-devkit/schematics`](http://npmjs.com/packages/@angular-devkit/schematics) | [![latest](https://img.shields.io/npm/v/%40angular-devkit%2Fschematics/latest.svg)](http://npmjs.com/packages/@angular-devkit/schematics) | [![README](https://img.shields.io/badge/README--green.svg)](https://github.com/angular/devkit/blob/master/packages/angular_devkit/schematics/README.md)
 **Schematics CLI** | [`@angular-devkit/schematics-cli`](http://npmjs.com/packages/@angular-devkit/schematics-cli) | [![latest](https://img.shields.io/npm/v/%40angular-devkit%2Fschematics-cli/latest.svg)](http://npmjs.com/packages/@angular-devkit/schematics-cli) | 
 

packages/angular_devkit/core/README.md

@@ -0,0 +1,42 @@
+# Core
+> Shared utilities for Angular DevKit.
+
+# Exception
+
+# Json
+
+## Schema
+
+### SchemaValidatorResult
+```
+export interface SchemaValidatorResult {
+  success: boolean;
+  errors?: string[];
+}
+```
+
+### SchemaValidator
+
+```
+export interface SchemaValidator {
+  (data: any): Observable<SchemaValidatorResult>;
+}
+```
+
+### SchemaRegistry
+
+```
+export interface SchemaRegistry {
+  compile(schema: Object): Observable<SchemaValidator>;
+}
+```
+
+### CoreSchemaRegistry
+
+`SchemaRegistry` implementation using https://github.com/epoberezkin/ajv.
+
+# Logger
+
+# Utils
+
+# Virtual FS