Impress: Add new template "Pencil"

* From https://wiki.documentfoundation.org/Design/Whiteboards/Templates_for_LibreOffice_5.0
* Submitted under CC0
* Slightly modified by me

Change-Id: Ie5d3b0ba5561f8ac6796666a2c522acd71c3f0fe

extras/Package_tplpresnt.mk

@@ -25,6 +25,7 @@ $(eval $(call gb_Package_add_files,extras_tplpresnt,$(LIBO_SHARE_FOLDER)/templat
 	Impress.otp \
 	Midnightblue.otp \
 	Vivid.otp \
+	Pencil.otp \
 ))
 
 # vim: set noet sw=4 ts=4: