Add GNU Trove license information

GNU Trove is included in the Kotlin embeddable compiler shipped with
Gradle.

See gradle/kotlin-dsl-samples#70

LICENSE

@@ -993,3 +993,25 @@ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+------------------------------------------------------------------------------
+License for the GNU Trove library included by the Kotlin embeddable compiler
+------------------------------------------------------------------------------
+The source code for GNU Trove is licensed under the Lesser GNU Public License (LGPL).
+
+    Copyright (c) 2001, Eric D. Friedman All Rights Reserved. This library is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or
+    (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
+    even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+    You should have received a copy of the GNU Lesser General Public License along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+Two classes (HashFunctions and PrimeFinder) included in Trove are licensed under the following terms:
+
+    Copyright (c) 1999 CERN - European Organization for Nuclear Research. Permission to use, copy, modify, distribute and sell this software
+    and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and
+    that both that copyright notice and this permission notice appear in supporting documentation. CERN makes no representations about the
+    suitability of this software for any purpose. It is provided "as is" without expressed or implied warranty.
+
+The source code of modified GNU Trove library is available at
+    https://github.com/JetBrains/intellij-deps-trove4j (with trove4j_changes.txt describing the changes)