docs(operators): add documentation for skipWhile (#234)

Close #99

Author: ashwin-sureshkumar

src/operator-docs/filtering/skipWhile.ts

@@ -1,6 +1,60 @@
 import { OperatorDoc } from '../operator.model';
 
 export const skipWhile: OperatorDoc = {
-  'name': 'skipWhile',
-  'operatorType': 'filtering'
+  name: 'skipWhile',
+  operatorType: 'filtering',
+  signature: `
+    public skipWhile(predicate: Function): Observable
+  `,
+  parameters: [
+    {
+      name: 'predicate',
+      type: 'Function',
+      attribute: '',
+      description: `A function to test each item emitted from the source Observable.`
+    }
+  ],
+  marbleUrl: 'http://reactivex.io/rxjs/img/skipWhile.png',
+  shortDescription: {
+    description: `
+    Returns an Observable that skips all items emitted by the source Observable
+    as long as a specified condition holds true, but emits all further source items as soon as the condition becomes false.
+  `
+  },
+  examples: [
+    {
+      name: '',
+      code: `
+      import { range } from 'rxjs/observable/range';
+      import { skipWhile } from 'rxjs/operators';
+
+      const source = range(1, 20);
+      // skips all values until the first divisible by 7, then emit all values from then on
+      const example = source.pipe(
+                              skipWhile(val => val % 7 !== 0)
+                            );
+      const subscribe = example.subscribe(val => console.log(val));
+
+     // Ouput
+      7
+      8
+      9
+      10
+      11
+      12
+      13
+      14
+      15
+      16
+      17
+      18
+      19
+      20
+      `,
+      externalLink: {
+        platform: 'JSBin',
+        url: 'http://jsbin.com/qupucehelo/embed?js,console,output'
+      }
+    }
+  ]
 };