Use common strings.xml for both baresip and baresip+

app/src/main/AndroidManifest.xml

@@ -109,7 +109,7 @@
         <activity
             android:name=".AboutActivity"
             android:configChanges="orientation|keyboardHidden|screenSize"
-            android:label="@string/about"
+            android:label="@string/about_title"
             android:parentActivityName=".MainActivity">
         </activity>
 

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

@@ -1,8 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <string name="app_name" translatable="false">baresip</string>
+    <string name="app_name_plus" translatable="false">baresip+</string>
     <!-- About Activity -->
     <string name="about_title">About baresip</string>
+    <string name="about_title_plus">About baresip+</string>
     <string name="about_text">
         <![CDATA[
         <h1>Baresip library based SIP User Agent</h1>
@@ -33,6 +35,39 @@
         where also issues can be reported.
         ]]>
     </string>
+    <string name="about_text_plus">
+        <![CDATA[
+        <h1>Baresip library based SIP User Agent with video calls</h1>
+        <p>Juha Heinanen &lt;[email protected]&gt;</p>
+        <p>Version %1$s</p>
+        <h2>Usage Hints</h2>
+        <ul>
+            <li>Check that default values in Settings meet your needs (touch item titles for help).</li>
+            <li>Then in Accounts, create one or more accounts (again touch item titles for help).</li>
+            <li>Registration status of an account is shown with a colored dot:  green (registration
+            succeeded, yellow (registration is in progress), red (registration failed), white (registration
+            has not been activated).</li>
+            <li>Swipe down gesture causes re-registration of the currently shown account.</li>
+            <li>Peers of calls and messages can be added to contacts by long touches.</li>
+            <li>Long touches can also be used to remove calls, chats, messages, and contacts.</li>
+            <li>Touch/long touch of contact icon can be used to install/remove image avatar.</li>
+            <li>You can re-reselect the previous call party by touching the call icon when Callee is empty.</li>
+            <li>If you cannot hear the other party during call, try to increase Media volume of
+            the device or set Default Call Volume in Settings.</li>
+        </ul>
+        <h2>Known Issues</h2>
+        <ul>
+            <li>Due to limitations in underlying libraries, multiple
+            concurrently active network interfaces are not supported.</li>
+            <li>In video calls, the device needs to be held in landscape
+            mode rotated 90 degrees left from portrait orientation.</li>
+            <li>Selfview is not shown when video stream is sendonly.</li>
+        </ul>
+        <h2>Source code</h2>
+        Source code is available at <a href="https://github.com/juha-h/baresip-studio">GitHub</a>,
+        where also issues can be reported.
+        ]]>
+    </string>
     <string name="baresip_link" translatable="false">
         <a href="https://github.com/juha-h/baresip-studio">GitHub</a>
     </string>