Glossary - Watchtowers

Added an entry on LN watchtowers. Used the ION Wiki to check some of this info. Please credit accordingly. https://wiki.ion.radar.tech/tech/research/watchtowers
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 wallet::
    Software that holds all your Bitcoin addresses and secret keys. Use it to send, receive, and store your bitcoin.
+    
+watchtower::
+    Watchtowers are a security service on the Lightning network that monitor channels.
+    In the case that one of the channel partners goes offline or loses their backup, a watchtower keep their own backups and can restore their channel information.
+    They also monitor the Bitcoin blockchain and can submit a penalty transaction in the case that one of the partners tries to "cheat" by broadcasting an outdated state.
+    Watchtowers can be run by the channel partners themselves, or as a paid service offered by a third party.
+    Wathctowers have no control over the funds in the channels themselves.
+    

 Some contributed definitions have been sourced under a CC-BY license from the https://en.bitcoin.it/wiki/Main_Page[Bitcoin Wiki], https://en.wikipedia.org[Wikipedia], https://github.com/bitcoinbook/bitconbook[Mastering Bitcoin] or from other open source documentation sources.