Added attribution menu

app/src/main/java/eu/faircode/email/FragmentAbout.java

@@ -69,6 +69,8 @@ public class FragmentAbout extends FragmentBase {
                         getIntentChangelog().resolveActivity(pm) != null);
         menu.findItem(R.id.menu_issue).setVisible(
                 Helper.getIntentIssue(getContext()).resolveActivity(pm) != null);
+        menu.findItem(R.id.menu_attribution).setVisible(
+                Helper.getIntentAttribution().resolveActivity(pm) != null);
         super.onPrepareOptionsMenu(menu);
     }
 
@@ -81,6 +83,9 @@ public class FragmentAbout extends FragmentBase {
             case R.id.menu_issue:
                 onMenuIssue();
                 return true;
+            case R.id.menu_attribution:
+                onMenuAttribution();
+                return true;
             default:
                 return super.onOptionsItemSelected(item);
         }
@@ -94,6 +99,10 @@ public class FragmentAbout extends FragmentBase {
         startActivity(Helper.getIntentIssue(getContext()));
     }
 
+    private void onMenuAttribution() {
+        startActivity(Helper.getIntentAttribution());
+    }
+
     private Intent getIntentChangelog() {
         Intent intent = new Intent(Intent.ACTION_VIEW);
         intent.setData(Uri.parse(BuildConfig.CHANGELOG));

app/src/main/java/eu/faircode/email/Helper.java

@@ -260,6 +260,12 @@ public class Helper {
             return new Intent(Intent.ACTION_VIEW, Uri.parse(XDA_URI));
     }
 
+    static Intent getIntentAttribution() {
+        Intent intent = new Intent(Intent.ACTION_VIEW);
+        intent.setData(Uri.parse("https://github.com/M66B/FairEmail/blob/master/README.md#attribution"));
+        return intent;
+    }
+
     // Graphics
 
     static int dp2pixels(Context context, int dp) {

app/src/main/res/menu/menu_about.xml

@@ -10,4 +10,9 @@
         android:id="@+id/menu_issue"
         android:title="@string/menu_issue"
         app:showAsAction="never" />
+
+    <item
+        android:id="@+id/menu_attribution"
+        android:title="@string/menu_attribution"
+        app:showAsAction="never" />
 </menu>

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

@@ -80,6 +80,7 @@
     <string name="menu_legend">Legend</string>
     <string name="menu_faq">Support</string>
     <string name="menu_issue">Report issue</string>
+    <string name="menu_attribution">Attribution</string>
     <string name="menu_privacy">Privacy</string>
     <string name="menu_about">About</string>