ProfileEdit: Add empty activity/fragment

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

app/src/main/java/com/wireguard/android/ProfileEditActivity.java

@@ -0,0 +1,19 @@
+package com.wireguard.android;
+
+import android.view.MenuItem;
+
+/**
+ * Activity that allows editing a single WireGuard profile.
+ */
+
+public class ProfileEditActivity extends ProfileActivity {
+    @Override
+    public void onMenuEdit(MenuItem item) {
+        throw new IllegalStateException();
+    }
+
+    @Override
+    public void onMenuSave(MenuItem item) {
+
+    }
+}