Added: First time installation configuration

docs/Bazarr/First-time-installation-configuration.md

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+
+# First Time Installation Configuration
+
+After you've installed everything it's best to check all of your settings,
+
+!!! attention
+    Bazarr only searches for subs for Episodes and Movies that are added after the install.
+
+    So you will need to set the preferred languages for your existing Shows and Movies.
+
+In this example I will show you how to do that with the series.
+
+![!mass-edit](images/mass-edit.png)
+
+click on `Mass Edit`
+
+![!select-all](images/select-all.png)
+
+1. Select all.
+1. Select your Language Profile you created earlier.
+1. Click on `Save`.
+
+Then go back to your Movies home screen and do the same for your Movies.
+If you've done it correctly you will get something that looks like the following screenshot with your preferred languages.
+
+![!languages-profile](images/languages-profile.png)