Publish Nerbus source snapshot and build documentation

core/COPYING

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+Copyright (c) 2009-2017 The Bitcoin Core developers
+Copyright (c) 2009-2018 Bitcoin Developers
+Copyright (c) 2016-2024 The Zcash developers
+Copyright (c) 2016-2025 The Komodo developers
+Copyright (c) 2018-2025 The VerusCoin developers
+
+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.
+
+
+The MIT software license (https://www.opensource.org/licenses/mit-license.php)
+above applies to the code directly included in this source distribution, with
+the exception of certain Autoconf macros. Dependencies downloaded as part of
+the build process may be covered by other open-source licenses. The MIT-licensed
+source code is not considered a derived work of these Autoconf macros or of the
+dependencies. For further details see 'contrib/debian/copyright'.
+
+
+This product includes software developed by the OpenSSL Project for use in the
+OpenSSL Toolkit (https://www.openssl.org/). This product includes cryptographic
+software written by Eric Young (eay@cryptsoft.com).
+
+
+Although almost all of the Zcash/Komodo/VerusCoin code is licensed under "permissive" open source
+licenses, users and distributors should note that when built using the default
+build options, Verus depends on Oracle Berkeley DB 6.2.x, which is licensed
+under the GNU Affero General Public License. Additionally, src/pbaas/shuffle_compat.h, which
+is used solely for Apple Mac platform builds, contains source code derived from GCC libstdc++
+(Copyright 2009-2023 Free Software Foundation) for consensus compatibility when building
+without libstdc++, also governed by GPLv3.
+
+Contributors should understand licensing implications before modifying the
+following files in build-aux/m4 (see https://github.com/zcash/zcash/issues/2827):
+
+ * ax_check_compile_flag.m4
+ * ax_check_link_flag.m4
+ * ax_check_preproc_flag.m4
+ * ax_pthread.m4