Add LICENSE file

# Why is the change needed?

This change is required to include proper licensing information about both Neo-GATE and GATE, as the latter is licensed under the MIT license, which requires derived work to include a copy of the license itself.

# What changes does the patch introduce?

This patch introduce the `LICENSE` file, which contains all licensing information required for Neo-GATE.

# How was this patch tested?

No tests are required.

LICENSE

@@ -0,0 +1,367 @@
+Copyright 2024 FBK
+
+Licensed under the Creative Commons Attribution 4.0 International Public License.
+
+By exercising the Licensed Rights (defined below), You accept and agree
+to be bound by the terms and conditions of this Creative Commons
+Attribution 4.0 International Public License ("Public License"). To the
+extent this Public License may be interpreted as a contract, You are
+granted the Licensed Rights in consideration of Your acceptance of
+these terms and conditions, and the Licensor grants You such rights in
+consideration of benefits the Licensor receives from making the
+Licensed Material available under these terms and conditions.
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+
+Section 1 -- Definitions.
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+  a. Adapted Material means material subject to Copyright and Similar
+     Rights that is derived from or based upon the Licensed Material
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+     Adapted Material is always produced where the Licensed Material is
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+  b. Adapter's License means the license You apply to Your Copyright
+     and Similar Rights in Your contributions to Adapted Material in
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+     Rights, without regard to how the rights are labeled or
+     categorized. For purposes of this Public License, the rights
+     specified in Section 2(b)(1)-(2) are not Copyright and Similar
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+  d. Effective Technological Measures means those measures that, in the
+     absence of proper authority, may not be circumvented under laws
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+     Treaty adopted on December 20, 1996, and/or similar international
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+Section 5 -- Disclaimer of Warranties and Limitation of Liability.
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+Section 6 -- Term and Termination.
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+     right the Licensor may have to seek remedies for Your violations
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+     minimum extent necessary to make it enforceable. If the provision
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+
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+
+
+=======================================================================
+
+Creative Commons is not a party to its public licenses.
+Notwithstanding, Creative Commons may elect to apply one of its public
+licenses to material it publishes and in those instances will be
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+licenses is dedicated to the public domain under the CC0 Public Domain
+Dedication. Except for the limited purpose of indicating that material
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+
+Creative Commons may be contacted at creativecommons.org.
+
+=======================================================================
+
+Neo-GATE was built on top of GATE (Rarrick et al., 2023), which is released with the open source MIT licence below.
+
+MIT License
+
+Copyright (c) 2023 Microsoft Translator
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.