Update 3rdpartynotices file with ref to ipywidgets (#8900)

Author: DonJayamanne

ThirdPartyNotices-Repository.txt

@@ -16,6 +16,7 @@ Microsoft Python extension for Visual Studio Code incorporates third party mater
 13. nteract (https://github.com/nteract/nteract)
 14. less-plugin-inline-urls (https://github.com/less/less-plugin-inline-urls/)
 15. jupyter-notebook (https://github.com/jupyter/notebook)
+16. ipywidgets (https://github.com/jupyter-widgets)
 
 
 %%
@@ -1028,3 +1029,35 @@ to indicate the copyright and license terms:
 
 =========================================
 END OF jupyter notebook NOTICES, INFORMATION, AND LICENSE
+
+%% ipywidgets NOTICES, INFORMATION, AND LICENSE BEGIN HERE
+=========================================
+Copyright (c) 2015 Project Jupyter Contributors
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+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.
+=========================================
+END OF ipywidgets NOTICES, INFORMATION, AND LICENSE