Overview of Hush doc

doc/overview.md

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+# Hush Overview
+
+## Mining Algorithm
+
+Equihash (200,9) (ASIC)
+
+## Block time
+
+75 seconds
+
+## Block size
+
+4MB
+
+## P2P
+
+TLS1.3 via WolfSSL is enforced for all network connections as of v3.6.1
+
+## RPC
+
+Inherited many RPC's from Bitcoin and Zcash with many new ones
+
+## Consensus
+
+Hush is a mandatory privacy blockchain as of Block 340000 (Nov 2020),
+which means you can only send to a shielded address, never to a transparent
+address. This is enforced via consensus rules and sometimes called "z2z".