add a page about the IDE

Author: martinbonnin

Writerside/doc.tree

@@ -14,6 +14,7 @@
         <toc-element topic="scalars.md"/>
         <toc-element topic="execution-context.md"/>
         <toc-element topic="persisted-documents.md"/>
+        <toc-element topic="ide.md"/>
         <toc-element topic="schema-dump.md"/>
     </toc-element>
     <toc-element toc-title="Integrations">

Writerside/topics/ide.md

@@ -0,0 +1,22 @@
+# GraphQL IDE
+
+One of GraphQL strong points is tooling. 
+
+Apollo Kotlin Execution comes with a built-in IDE that makes it easy to explore your schema and debug your operations.
+
+You can get a ready-to-serve version of [Apollo Sandbox](https://studio.apollographql.com/sandbox/explorer/) using the `sandboxHtml()` function:
+
+```kotlin
+val pageTitle = "Welcome to my API"
+val initialEndpoint = "http://localhost:8080/graphql"
+
+sandboxHtml(title = pageTitle, initialEndpoint = initialEndpoint)
+```
+
+[![Apollo Sandbox](sandbox.png)](http://localhost:8080/sandbox/index.html)
+
+You can then serve it using your favorite server or use any of the existing integrations: 
+
+* [Spring](spring.md)
+* [Ktor](ktor.md)
+* [http4k](http4k.md)