added basic documentation with pyscaffold and tox. A lot of it is probably wrong.

src/meshctrl/__init__.py

@@ -1 +1,16 @@
-from .session import Session
+import sys
+
+if sys.version_info[:2] >= (3, 8):
+    # TODO: Import directly (no need for conditional) when `python_requires = >= 3.8`
+    from importlib.metadata import PackageNotFoundError, version  # pragma: no cover
+else:
+    from importlib_metadata import PackageNotFoundError, version  # pragma: no cover
+
+try:
+    # Change here if project is renamed and does not equal the package name
+    dist_name = "meshctrl"
+    __version__ = version(dist_name)
+except PackageNotFoundError:  # pragma: no cover
+    __version__ = "unknown"
+finally:
+    del version, PackageNotFoundError