Implement authorization against the Users database and issue token based on password validation.

bin/Debug/MarketDataServer.exe.config

@@ -3,6 +3,7 @@
   <appSettings>
     <add key="market_data" value="Database=market_data;Datasource=localhost;Username=root;Password=dbas" />
     <add key="portfolio_data" value="Database=portfolio_data;Datasource=localhost;Username=root;Password=dbas" />
+    <add key="user_data" value="Database=user_data;Datasource=localhost;Username=root;Password=dbas" />
     <add key="sms_smtpaddress" value="smtp.gmail.com" />
     <add key="sms_smsusername" value="skessler1964@gmail.com" />
     <add key="sms_smspassword" value="MN5191306B" />