Update README.md

Author: andreasrosdal

openpdf-kotlin/README.md

@@ -1,3 +1,5 @@
+# OpenPDF-Kotlin
+
 **OpenPDF Kotlin** is an *experimental* Kotlin extension module for [OpenPDF](https://github.com/LibrePDF/OpenPDF). 
 It provides idiomatic Kotlin APIs, utilities, and builder-style functionality for working with PDF documents.
 
@@ -10,13 +12,13 @@ This submodule makes OpenPDF more convenient and expressive for Kotlin developer
 
 Kotlin pull requests are welcome!
 
-## Kotlin based OpenPDF projects!
+### Kotlin based OpenPDF projects!
 
 * https://github.com/ralfstuckert/openpdf-markdown
 
 ---
 
-## Example Usage
+### Example Usage
 
 ### Make PDF file from HTML: