Add post about Tor hidden service

Announce #568.

Author: laanwj

_posts/en/posts/2020-03-27-hidden-service.md

@@ -0,0 +1,25 @@
+---
+title: bitcoincore.org hidden service
+name: hidden-service
+id: en-hidden-service
+lang: en
+type: posts
+layout: post
+
+## If this is a new post, reset this counter to 1.
+version: 1
+
+## Only true if release announcement or security annoucement.  English posts only
+announcement: 0
+
+excerpt: >
+  After frequent requests, this site is now reachable as a Tor hidden service
+---
+After frequent requests, this site is now reachable as a Tor hidden service
+through an onion address:
+
+<http://6hasakffvppilxgehrswmffqurlcjjjhd76jgvaqmsg6ul25s7t3rzyd.onion/>
+
+As well as adding another means of censorship resistance, a hidden
+service gives an alternative trust path that doesn't rely on certificate
+authorities nor DNS infrastructure.