RPC - Add new uptime RPC

_includes/devdoc/dash-core/rpcs/quick-reference.md

@@ -155,6 +155,7 @@ These RPCs are all Dash-specific and not found in Bitcoin Core
 * [GetMemoryInfo][rpc getmemoryinfo]: {{summary_getMemoryInfo}} {{DASH_UPDATED0_14_1}} {{NEW_14_0}}
 * [Help][rpc help]: {{summary_help}}
 * [Stop][rpc stop]: {{summary_stop}}
+* [Uptime][rpc uptime]: {{summary_uptime}}
 
 {% endautocrossref %}
 

_includes/devdoc/dash-core/rpcs/rpcs/uptime.md

@@ -0,0 +1,42 @@
+{% comment %}
+This file is licensed under the MIT License (MIT) available on
+http://opensource.org/licenses/MIT.
+{% endcomment %}
+{% assign filename="_includes/devdoc/dash-core/rpcs/rpcs/uptime.md" %}
+<!--__-->
+
+##### Uptime
+{% include helpers/subhead-links.md %}
+
+{% assign summary_uptime="returns the total uptime of the server." %}
+
+{% autocrossref %}
+
+The `uptime` RPC {{summary_uptime}}
+
+*Parameters: none*
+
+*Result*
+
+{% itemplate ntpd1 %}
+- n: "`result`"
+  t: "number (int)"
+  p: "Required<br>(exactly 1)"
+  d: "The number of seconds that the server has been running"
+
+{% enditemplate %}
+
+*Example from Dash Core 0.14.1*
+
+{% highlight bash %}
+dash-cli -testnet uptime
+{% endhighlight %}
+
+Result:
+{% highlight text %}
+5500
+{% endhighlight %}
+
+*See also: none*
+
+{% endautocrossref %}