Add details for London Node User Group to meetups page (#2061)

* added details for LNUG

* added LNUG twitter and github

* format and split lists for workshops and snug

* Update locale/en/get-involved/node-meetups.md

Co-Authored-By: admataz <adam@admataz.com>

Author: admataz

locale/en/get-involved/node-meetups.md

@@ -533,13 +533,15 @@ REQUIREMENTS
 ### UK
 
 ##### London
-
+###### LNUG
 - [Meetup](https://www.meetup.com/london-nodejs/)
+- [GitHub/lnug](https://github.com/lnug/)
 - Frequency of meetups - monthly
-- How to submit a talk? 
+- How to submit a talk? Visit our [speakers repos](https://github.com/lnug/speakers), read the guidelines, and [submit a talk proposal as a new issue](https://github.com/lnug/speakers/issues). 
 - Organizer name - Adam Davis
-- Organizer contact info -
+- Organizer contact info - contact@lnug.org, [@lnugOrg](https://twitter.com/lnugorg)
 
+###### Node Workshops
 - [Meetup](https://www.meetup.com/NodeWorkshops//)
 - Frequency of meetups - monthly
 - How to submit a talk?