Added nym

Author: gilescope

README.md

@@ -72,6 +72,8 @@
 - [Nervos CKB](https://github.com/nervosnetwork/ckb).
   Nervos CKB is a public permissionless blockchain, the common
   knowledge layer of Nervos network.
+- [NIM](https://github.com/nymtech/nym).
+  Selective privacy via a mixnet preventing metadata analysis.
 - [Nomic](https://github.com/nomic-io/nomic).
   Nomic is a high-performance Bitcoin sidechain which is part of the
   Cosmos network.