Add generated documentation to gitignore

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss [email protected]

Author: akosthekiss

.gitignore

@@ -44,3 +44,6 @@ targets/mbedk64f/yotta_targets
 .output
 targets/esp8266/output.map
 targets/esp8266/libs
+
+# Generated documentation
+docs/doxygen