finish basic structure, but needs more improvement

.gitignore

@@ -0,0 +1,69 @@
+# Project-specific generated files
+docs/build/
+
+bench/results/
+bench/env/
+bench/trio/
+
+# Byte-compiled / optimized / DLL files / editor temp files
+__pycache__/
+*.py[cod]
+*~
+\#*
+.#*
+*.swp
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+/build/
+/develop-eggs/
+/dist/
+/eggs/
+/lib/
+/lib64/
+/parts/
+/sdist/
+/var/
+*.egg-info/
+.installed.cfg
+*.egg
+/.pybuild
+
+# Installer logs
+pip-log.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.venv/
+.coverage
+.coverage.*
+.cache
+.pytest_cache/
+.mypy_cache/
+nosetests.xml
+coverage.xml
+
+# Translations
+*.mo
+
+# Mr Developer
+.mr.developer.cfg
+.project
+.pydevproject
+
+# Rope
+.ropeproject
+
+# Django stuff:
+*.log
+*.pot
+
+# Sphinx documentation
+doc/_build/
+
+# vscode config file
+.vscode/*

README.md

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+# Nu plugin binary reader
+A general binary parser based on [kaitai struct](https://formats.kaitai.io/).
+
+## Require python version
+python3.7+
+
+## Usage
+1. register the plugin to nushell
+```
+register -e json plugin.py
+```
+
+It will introduce a new command: `from-binary`. So you can just play with it.
+
+## Usage example
+1. read and parse png file:
+```
+open capture.PNG | from-binary png | get ihdr
+```
+
+2. read and parse ttf file:
+```
+open FiraCode-VF.ttf | from-binary ttf | get directory_table
+```
+
+## Note
+The `kaitaistruct.py` is just a copy of [kaitai struct python runtime](https://github.com/kaitai-io/kaitai_struct_python_runtime), put it directly here, so we don't need extra requirements.
+And `reader/*.py` are just a copy of auto-generated parser, DON'T CHANGE IT.