Added about menu.

briar-android/src/main/java/org/briarproject/briar/android/settings/AboutFragment.java

@@ -0,0 +1,50 @@
+package org.briarproject.briar.android.settings;
+
+import android.os.Bundle;
+import android.text.method.LinkMovementMethod;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import org.briarproject.bramble.api.nullsafety.MethodsNotNullByDefault;
+import org.briarproject.bramble.api.nullsafety.ParametersNotNullByDefault;
+import org.briarproject.briar.BuildConfig;
+import org.briarproject.briar.R;
+
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+
+@MethodsNotNullByDefault
+@ParametersNotNullByDefault
+public class AboutFragment extends Fragment {
+
+	private TextView briarVersion;
+	private TextView briarWebsite;
+	private TextView briarSourceCode;
+
+	@Nullable
+	@Override
+	public View onCreateView(@NonNull LayoutInflater inflater,
+			@Nullable ViewGroup container,
+			@Nullable Bundle savedInstanceState) {
+		return inflater.inflate(R.layout.fragment_about, container,
+				false);
+	}
+
+	@Override
+	public void onStart() {
+		super.onStart();
+		requireActivity().setTitle(R.string.about_title);
+		briarVersion = requireActivity().findViewById(R.id.BriarVersion);
+		briarVersion.setText(getString(R.string.briar_version) + " " +
+				BuildConfig.VERSION_NAME);
+		briarWebsite = requireActivity().findViewById(R.id.BriarWebsite);
+		briarSourceCode = requireActivity().findViewById(R.id.BriarSourceCode);
+		briarWebsite.setMovementMethod(LinkMovementMethod.getInstance());
+		briarSourceCode.setMovementMethod(LinkMovementMethod.getInstance());
+	}
+
+}