added support for python3

Author: cyb3r-w0lf

README.md

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+# Xamarin AssemblyStore Explorer (pyxamstore)
+This is an alpha release of an `assemblies.blob` AssemblyStore parser written in Python. The tool is capable of unpack and repackaging `assemblies.blob` and `assemblies.manifest` Xamarin files from an APK.
+
+## Installing
+```shell
+    pip3 install build && python3 -m build && pip install --force-reinstall dist/pyxamstore-1.0.0-py3-none-any.whl
+```
+
+You can then use the tool by calling `pyxamstore`
+
+## Usage
+### Unpacking
+I recommend using the tool in conjunction with `apktool`. The following commands can be used to unpack an APK and unpack the Xamarin DLLs:
+
+    apktool d yourapp.apk
+    pyxamstore unpack -d yourapp/unknown/assemblies/
+
+Assemblies that are detected as compressed with LZ4 will be automatically decompressed in the extraction process.
+
+### Repacking
+If you want to make changes to the DLLs within the AssemblyStore, you can use `pyxamstore` along with the `assemblies.json` generated during the unpack to create a new `assemblies.blob` file(s). The following command from the directory where your `assemblies.json` file exists:
+
+    pyxamstore pack
+
+From here you'll need to copy the new manifest and blobs as well as repackage/sign the APK.
+
+# Additional Details
+Additional file format details can be found on my [personal website](https://www.thecobraden.com/posts/unpacking_xamarin_assembly_stores/).
+
+# Known Limitations
+* DLLs that have debug/config data associated with them

pyproject.toml

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+[tool.poetry]
+name = "pyxamstore"
+version = "1.0.0"
+description = "Python utility for parsing Xamarin AssemblyStore blob files"
+authors = ["jakev"]
+keywords = ["android", "device", "security", "mobile", "reverse-engineering", "Xamarin", "AssemblyStore", "reverse", "hacking"]
+
+classifiers = [
+    'Development Status :: 3 - Alpha',
+    'Natural Language :: English',
+    'License :: OSI Approved :: MIT License',
+    'Programming Language :: Python',
+    'Programming Language :: Python :: 3',
+    'Programming Language :: Python :: 3.6',
+    'Programming Language :: Python :: 3.7',
+    'Programming Language :: Python :: 3.8',
+    'Programming Language :: Python :: 3.9',
+    'Programming Language :: Python :: 3.10',
+    'Programming Language :: Python :: 3.11',
+]
+license = "MIT"
+readme = "README.md"
+homepage = "https://github.com/jakev/pyxamstore"
+repository = "https://github.com/jakev/pyxamstore"
+documentation = "https://github.com/jakev/pyxamstore"
+
+[tool.poetry.dependencies]
+python = "^3.6"
+docopt = "^0.6.2"
+
+[tool.poetry.dev-dependencies]
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"
+
+[tool.poetry.scripts]
+pyxamstore = "pyxamstore:main"