add v0.12.0 release notes

doc/release-notes/release-notes-v0.12.0.md

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+### MMGen Version 0.12.0 Release Notes
+
+#### Important new features:
+
+ - XOR seed splitting: 7311f474, 237567bc, c7ca0c3d (see
+   [XOR-Seed-Splitting:-Theory-and-Practice][xo] for additional information)
+ - ETH tracking-wallet balance caching, Parity light client optimizations:
+   d0f8c44b
+ - Full BIP39 mnemonic support: 8519b68b, 8705e57b
+ - Monero new-style mnemonic support: cfa16418
+ - New die-roll wallet format, interactive die-roll entry: c7786369, 4714ef84
+
+#### Other changes/additions/improvements:
+
+ - New plain hex file wallet format: 15ac6c69
+ - libsecp256k1 support for MSYS2: c260fbf9
+ - Monero wallet creation/syncing tool reimplemented, now works under MSYS2:
+   3951925a
+ - New Tool API interface: f8056630
+ - Full automation of test suite, automatic starting/stopping of daemons
+ - Plus lots of code cleanups, bugfixes, and additional tests!
+
+This release has been tested on the following platforms:
+
+		Debian Buster / x86_64
+        Windows 10 Enterprise Eng. / MSYS2 / qemu-x86_64
+
+and with the following coin daemon versions:
+
+        Bitcoin Core v0.19.0.1
+        Bitcoin-ABC v0.20.9
+        Litecoin Core v0.17.1
+        Monerod v0.15.0.1
+        Parity Ethereum v2.7.2
+
+Testing TBD on the following platforms:
+
+        Ubuntu Bionic / x86_64 / qemu-x86_64
+        Ubuntu Xenial (+Python 3.6.7) / x86_64
+        Armbian Bionic / Orange Pi PC2 (no Parity or Monerod)
+        Raspbian Stretch / Raspberry Pi B (no Parity or Monerod)
+
+Altcoin address generation has been additionally tested using the following
+tools as references:
+
+        zcash-mini a2b35042 (https://github.com/FiloSottile/zcash-mini)
+        pycoin 11f60a7c (https://github.com/richardkiss/pycoin)
+        vanitygen-plus 22123128 (https://github.com/exploitagency/vanitygen-plus)
+
+[xo]: https://github.com/mmgen/mmgen/wiki/XOR-Seed-Splitting:-Theory-and-Practice.md