Add an example on how to encode using Kotlin (#950)

docs/modules/setup/examples/Encode.kt

@@ -0,0 +1,21 @@
+package main
+
+import java.util.Base64
+import java.util.zip.Deflater
+
+object Encode {
+
+  fun encode(decoded: String): String =
+    String(Base64.getUrlEncoder().encode(compress(decoded.toByteArray())), Charsets.UTF_8)
+
+  private fun compress(source: ByteArray): ByteArray {
+    val deflater = Deflater()
+    deflater.setInput(source)
+    deflater.finish()
+    val bytesCompressed = ByteArray(Short.MAX_VALUE.toInt())
+    val numberOfBytesAfterCompression = deflater.deflate(bytesCompressed)
+    val returnValues = ByteArray(numberOfBytesAfterCompression)
+    System.arraycopy(bytesCompressed, 0, returnValues, 0, numberOfBytesAfterCompression)
+    return returnValues
+  }
+}

docs/modules/setup/pages/encode-diagram.adoc

@@ -10,6 +10,7 @@ On this page you will learn how to encode a diagram using:
 - xref:javascript[]
 - xref:python[]
 - xref:java[]
+- xref:kotlin[]
 - xref:go[]
 - xref:php[]
 
@@ -115,6 +116,14 @@ include::example$encode.py[]
 include::example$Encode.java[]
 ----
 
+[#kotlin]
+== Kotlin
+
+[source,kotlin]
+----
+include::example$Encode.kt[]
+----
+
 [#go]
 == Go