Add ES2015 runtime transpilation sample

samples/misc/ES2015Transpilation/wwwroot/js/greeting.js

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+export default class Greeting {
+    getMessage() {
+        return 'Hello from the ES2015 class';
+    }
+}

samples/misc/ES2015Transpilation/wwwroot/js/main.js

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+import Greeting from './greeting.js';
+
+console.log(new Greeting().getMessage());

samples/misc/ES2015Transpilation/wwwroot/web.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <system.webServer>
+    <handlers>
+      <add name="httpPlatformHandler" path="*" verb="*" modules="httpPlatformHandler" resourceType="Unspecified"/>
+    </handlers>
+    <httpPlatform processPath="%DNX_PATH%" arguments="%DNX_ARGS%" stdoutLogEnabled="false"/>
+  </system.webServer>
+</configuration>