Adding the source code for CoinVault

The C#  implementation is now open source

Author: dangershony

bip-0044.mediawiki

@@ -267,7 +267,7 @@ is required and a pull request to the above file should be created.
 * [[https://play.google.com/store/apps/details?id=com.mycelium.wallet|Mycelium Bitcoin Wallet (Android)]] ([[https://github.com/mycelium-com/wallet|source]])
 * [[https://copay.io/|Copay]] ([[https://github.com/bitpay/copay|source]])
 * [[https://maza.club/encompass|Encompass]] ([[https://github.com/mazaclub/encompass|source]])
-* [[https://www.coinvault.io/|CoinVault]] 
+* [[https://www.coinvault.io/|CoinVault]] ([[https://github.com/CoinVault/dotblock|source]])
 ==Reference==
 
 * [[bip-0032.mediawiki|BIP32 - Hierarchical Deterministic Wallets]]