add an experimental feature for high image compression

res/values/arrays.xml

@@ -165,6 +165,16 @@
     <item>2</item>
   </string-array>
 
+  <string-array name="pref_compression_entries">
+    <item>Balanced</item>
+    <item>Worse quality, small size</item>
+  </string-array>
+
+  <string-array name="pref_compression_values">
+    <item>0</item>
+    <item>1</item>
+  </string-array>
+
   <!-- discrete MIME type (the part before the "/") -->
 
 

res/xml/preferences_advanced.xml

@@ -52,6 +52,21 @@
     </PreferenceCategory>
     <PreferenceCategory android:layout="@layout/preference_divider" />
 
+
+    <PreferenceCategory android:title="Experimental features">
+
+        <org.thoughtcrime.securesms.preferences.widgets.ListPreferenceWithSummary
+            android:key="pref_compression"
+            android:title="Outgoing image quality"
+            android:dependency="pref_compression"
+            android:entries="@array/pref_compression_entries"
+            android:entryValues="@array/pref_compression_values"
+            android:defaultValue="0" />
+
+    </PreferenceCategory>
+    <PreferenceCategory android:layout="@layout/preference_divider" />
+
+
     <PreferenceCategory android:title="@string/pref_other">
         <Preference android:key="pref_backup"
                     android:title="@string/pref_backup"