title: Add a custom column to Serilog Table in Azure Table Storage for logging new information
body: <p>It's possible to add a new column in a Serilog Table in Azure table Storage for logging new extra field like accountID or login Name?<br/><br/>
  I think it's possible to add a new column but its possible to pass extra fields in Serilog like i said for the new added columns? How i can define that in Startup.cs or web.config? Thanks</p>
  
  <p>This is my configuration in web.config:</p>
  
  <pre><code>&lt;add key="serilog:using:AzureTableStorage" value="Serilog.Sinks.AzureTableStorage" /&gt;
      &lt;add key="serilog:write-to:AzureTableStorageWithProperties.connectionString" value="DefaultEndpointsProtocol=https;AccountName=MyAccountName;AccountKey=MyAccountKey;EndpointSuffix=core.windows.net" /&gt;
      &lt;add key="serilog:write-to:AzureTableStorage.formatter" value="Serilog.Formatting.Compact.CompactJsonFormatter, Serilog.Formatting.Compact" /&gt;
      &lt;add key="serilog:write-to:AzureTableStorageWithProperties.storageTableName" value="Serilog" /&gt;
  </code></pre>
  
  <p>startup.cs configuration:</p>
  
  <pre><code>Log.Logger = new LoggerConfiguration()
          .ReadFrom.AppSettings()
          .CreateLogger();
  </code></pre>