Add basic text based rule

src/App.js

@@ -41,7 +41,7 @@ class App extends Component {
         }
         {showAnswer &&
           <div>
-            {getResult()}
+            {getResult(this.input.value)}
             <input type="button" onClick={this.toggleShowAnswer} ref={(back) => {this.back = back;}} value="Back"/>
           </div>
         }

src/results.js

@@ -1,9 +1,12 @@
 import React from 'react';
 import * as Rules from "./rules";
 
-export default function() {
+export default function(value) {
   if (Rules.Mac.getResult()) {
-    return <p>Get a PC</p>
+    return <p>Get a PC</p>;
+  } else if (Rules.Contribute.getResult(value)) {
+    window.location.href = "https://github.com/hoily/how-do-i";
+    return <p>Github</p>;
   } else {
     return <p>Don't</p>
   }

src/rules.js

@@ -7,15 +7,21 @@ const Rule = class Rule {
     if(options.os != null) {
       this.os = options.os
     }
+    if (options.text != null) {
+      this.text = options.text;
+    }
   }
 
-  getResult() {
-    if (this.os != null) {
+  getResult(input) {
+    if (this.text != null) {
+      return input.toLowerCase() === this.text.toLowerCase();
+    } else if (this.os != null) {
       return useragent.getOS().name === this.os;
     } else {
       return false
     }
   }
-}
+};
 
 export const Mac = new Rule({os: "Mac OS"});
+export const Contribute = new Rule({ text: "contribute" });