Should fix #174. Added the ability to set the font size of the content of the article reader.

app/src/main/res/values/strings.xml

@@ -164,4 +164,6 @@
     <string name="pref_switch_actions_pager_scroll">Mark articles as read when swiping between articles.</string>
     <string name="add_to_favs_reader">Add to favorites</string>
     <string name="remove_to_favs_reader">Remove from favorites</string>
+    <string name="pref_content_reader_font_size">Article reader content font size</string>
+    <string name="pref_header_viewer">Article viewer</string>
 </resources>

app/src/main/res/xml/pref_general.xml

@@ -76,9 +76,5 @@
         android:summaryOff="@string/pref_switch_actions_tap_off"
         android:summaryOn="@string/pref_switch_actions_tap_on"
         android:title="@string/pref_switch_actions_tap_title" />
-    <SwitchPreference
-        android:defaultValue="false"
-        android:key="mark_on_scroll"
-        android:title="@string/pref_switch_actions_pager_scroll" />
 
 </PreferenceScreen>

app/src/main/res/xml/pref_headers.xml

@@ -5,6 +5,12 @@
         android:icon="@drawable/ic_settings_black_24dp"
         android:title="@string/pref_header_general"/>
 
+
+    <header
+        android:fragment="apps.amine.bou.readerforselfoss.settings.SettingsActivity$ArticleViewerPreferenceFragment"
+        android:icon="@drawable/ic_chrome_reader_mode_black_24"
+        android:title="@string/pref_header_viewer"/>
+
     <header
         android:fragment="apps.amine.bou.readerforselfoss.settings.SettingsActivity$DebugPreferenceFragment"
         android:icon="@drawable/ic_bug_report"

app/src/main/res/xml/pref_viewer.xml

@@ -0,0 +1,14 @@
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <SwitchPreference
+        android:defaultValue="false"
+        android:key="mark_on_scroll"
+        android:title="@string/pref_switch_actions_pager_scroll" />
+
+    <EditTextPreference
+        android:defaultValue="14"
+        android:inputType="number"
+        android:key="reader_font_size"
+        android:selectAllOnFocus="true"
+        android:singleLine="true"
+        android:title="@string/pref_content_reader_font_size" />
+</PreferenceScreen>