Add pyproject.toml; remove setup.py

pyproject.toml

@@ -0,0 +1,45 @@
+[build-system]
+requires = [
+    "setuptools>=42",
+    "wheel",
+]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "tird"
+version = "0.16.0"
+license = { text = "CC0-1.0", url = "https://creativecommons.org/publicdomain/zero/1.0/" }
+maintainers = [
+    { name = "Alexey Avramov", email = "[email protected]" },
+]
+description = "A tool for encrypting files and hiding encrypted data"
+readme = { file = "README.md", content-type = "text/markdown" }
+keywords = [
+    "encryption",
+    "hiding",
+]
+classifiers = [
+    "Development Status :: 3 - Alpha",
+    "Environment :: Console",
+    "Intended Audience :: End Users/Desktop",
+    "License :: CC0 1.0 Universal (CC0 1.0) Public Domain Dedication",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python :: 3",
+    "Topic :: Security",
+    "Topic :: Security :: Cryptography",
+    "Topic :: Utilities",
+]
+dependencies = [
+    "pycryptodomex>=3.6.2",
+    "pynacl>=1.2.0",
+]
+requires-python = ">=3.6"
+
+[project.urls]
+"Bug Tracker" = "https://github.com/hakavlad/tird/issues"
+"Documentation" = "https://github.com/hakavlad/tird/blob/main/README.md"
+"Homepage" = "https://github.com/hakavlad/tird"
+"Repository" = "https://github.com/hakavlad/tird"
+
+[project.scripts]
+tird = "tird.tird:main"