add source code pro to license & credits files

LICENSE.md

@@ -69,6 +69,10 @@ RenderDoc also uses several external libraries and components which include thei
 - [stb](https://github.com/nothings/stb)
   released to the Public Domain by Sean Barrett
 
+- [Source Code Pro](https://github.com/adobe-fonts/source-code-pro)
+  distributed under the SIL Open Font License 1.1.
+  Copyright 2010, 2012 Adobe Systems Incorporated.
+
 - [IronPython](http://ironpython.net/)
   distributed under the Apache 2.0 license.
   Copyright IronPython Team

docs/Credits.aml

@@ -103,6 +103,14 @@
 </externalLink>
   </para></listItem>
   
+  <listItem><para>
+  <externalLink>
+<linkText>Source Code Pro</linkText>
+<linkAlternateText>Font used for the in-program overlay.</linkAlternateText>
+<linkUri>https://github.com/adobe-fonts/source-code-pro</linkUri>
+</externalLink>
+  </para></listItem>
+  
   <listItem><para>
   <externalLink>
 <linkText>IronPython</linkText>