Add documentation on using env variables

content/self-host/hardcode-settings/_index.en.md

@@ -0,0 +1,32 @@
+---
+title: Hardcoding Custom Settings 
+weight: 10
+---
+
+## Custom Server
+{{% notice note %}}
+To hardcode custom server settings into your executables you must [build](/docs/en/dev/build/) the client youself.
+{{% /notice %}}
+{{% notice note %}}
+**If you set eaither of these values without setting the other your executable will not work!**
+{{% /notice %}}
+
+You can set the following enviroment variables on your os and rustdesk will use those variables when compiling your client rather than the default rustdesk.com servers. 
+
+If you do not know how to set an enviroment variable on your system you should be able to find documentation for your os online that will explain this.
+
+#### RENDEZVOUS_SERVER
+This variable should be set to your server url.
+
+This should be a string such as
+```
+rustdesk.my-domain.com
+```
+
+#### RS_PUB_KEY_VAL
+This variable will be your public key, more information on the key is aviable [Here](/docs/en/self-host/install/#key)
+
+This should be a string such as
+```
+OeVuKk5nlHiXp+APNn0Y3pC1Iwpwn44JGqrQCsWqmBw=
+```