Add third-party license notices (Qt LGPL, zlib, minizip, picosha2 MIT) and privacy policy for Store submission

Author: omvs077

THIRD-PARTY-NOTICES.txt

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+THIRD-PARTY NOTICES
+====================
+FileFlattener (c) 2026 Dvvyom Labs. This product includes the following
+third-party software components. Each component is used under the terms
+of its own license, reproduced below.
+
+--------------------------------------------------------------------------
+Qt 6.11.1 (Qt Widgets, Qt Core, Qt Gui, Qt Network, Qt Svg)
+--------------------------------------------------------------------------
+Copyright (C) The Qt Company Ltd. and other contributors.
+Licensed under the GNU Lesser General Public License version 3 (LGPL-3.0).
+Full license text: https://www.gnu.org/licenses/lgpl-3.0.html
+Qt source code: https://code.qt.io/cgit/qt/
+
+FileFlattener links against Qt dynamically (via shared .dll files deployed
+alongside the application by windeployqt), which satisfies the LGPL-3.0
+requirement that users be able to relink the application against a
+modified version of Qt. The unmodified Qt shared libraries distributed
+with this application can be replaced by the end user with their own
+compatible Qt 6.11.1 builds.
+
+--------------------------------------------------------------------------
+zlib 1.3.2
+--------------------------------------------------------------------------
+Copyright (C) 1995-2024 Jean-loup Gailly and Mark Adler.
+Licensed under the zlib License.
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not
+   be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+
+--------------------------------------------------------------------------
+minizip 1.3.2
+--------------------------------------------------------------------------
+Copyright (C) 1998-2010 Gilles Vollant, (C) 2007-2008 Even Rouault,
+(C) 2009-2010 Mathias Svensson.
+Licensed under the zlib License (see zlib license text above, which
+minizip is distributed under as part of the zlib source tree).
+
+--------------------------------------------------------------------------
+PicoSHA2 1.0.1
+--------------------------------------------------------------------------
+Copyright (C) 2017 okdshin.
+Licensed under the MIT License.
+
+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 LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

docs/privacy-policy.md

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+# Privacy Policy — FileFlattener
+
+**Last updated: August 2026**
+
+FileFlattener is a Windows desktop application developed by Dvvyom Labs
+(Om Shivade). This policy explains what data the application does and
+does not collect.
+
+## Data Collection
+
+FileFlattener does **not** collect, transmit, or store any personal data,
+usage analytics, telemetry, or diagnostic information. The application
+does not connect to the internet or any remote server during operation.
+
+## Local Data
+
+FileFlattener reads and writes files only within folders explicitly
+selected by the user (for scanning, deduplication, and ZIP export). It
+stores a small local settings file (via Windows QSettings, under the
+registry key `HKEY_CURRENT_USER\Software\FileFlattener`) containing:
+
+- The list of the user's 5 most recently opened project folder paths
+- User interface preferences
+
+This data never leaves the user's device and is not accessible to
+Dvvyom Labs or any third party.
+
+## Third-Party Services
+
+FileFlattener does not integrate with any third-party analytics,
+advertising, or cloud services.
+
+## Children's Privacy
+
+FileFlattener does not knowingly collect data from anyone, including
+children, because it collects no data at all.
+
+## Changes to This Policy
+
+If this policy changes, the updated version will be published at this
+same URL with a revised "Last updated" date.
+
+## Contact
+
+For questions about this privacy policy, contact: omvs077@gmail.com
+
+Repository: https://github.com/omvs077/FileFlattener