[enh] #161 Add example for mnemonic wallet creation

Add mnemonic package as dependency
See https://github.com/trezor/python-mnemonic

examples/create_mnemonic_wallet.py

+# Copyright  2014-2021 Vincent Texier <vit@free.fr>
+#
+# DuniterPy is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# DuniterPy is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+import os
+from pathlib import Path
+
+import mnemonic
+
+from duniterpy.key import SigningKey
+
+################################################
+
+
+def create_mnemonic_wallet():
+
+    # list supported language for mnemonic passphrase
+    print("List of supported languages for passphrase:\n")
+    wordlist_path = Path(mnemonic.__path__[0]).joinpath("wordlist")
+    language_filenames = os.listdir(wordlist_path)
+    for index, language_filename in enumerate(language_filenames):
+        print(f"{index}) {Path(language_filename).stem}")
+
+    # prompt language index
+    language_index = int(input("\nChoose language index for the mnemonic passphrase: "))
+
+    # get language name from filename
+    language = Path(language_filenames[language_index]).stem
+
+    # generate mnemonic wallet with 128bits strength (12 words)
+    passphrase = mnemonic.Mnemonic(language).generate(strength=128)
+
+    # Create key object
+    key = SigningKey.from_dubp_mnemonic(mnemonic=passphrase)
+
+    # Display wallet passphrase and public key
+    print(f"\nPassphrase: {passphrase}")
+    print(f"Public key: {key.pubkey}")
+
+
+if __name__ == "__main__":
+    create_mnemonic_wallet()

pyproject.toml

@@ -34,6 +34,7 @@ libnacl = "^1.7.2"
 pyaes = "^1.6.1"
 graphql-core = "^3.1.2"
 websocket-client = "^0.57"
+mnemonic = "^0.19"
 
 [tool.poetry.dev-dependencies]
 black = {version = "^21.4b2", allow-prereleases = true}