added attribute __version__

Author: harisankar95

pathfinding3d/__init__.py

@@ -1 +1,7 @@
+import os
+
 __all__ = ["core", "finder"]
+
+# read the version from version.txt
+with open(os.path.join(os.path.dirname(__file__), "version.txt"), encoding="utf-8") as file_handler:
+    __version__ = file_handler.read().strip()

test/test_version.py

@@ -0,0 +1,16 @@
+import os
+
+
+def test_version():
+    """
+    Test if __version__ is correctly read from version.txt
+    """
+    from pathfinding3d import __version__
+
+    # Read the version from version.txt
+    with open(
+        os.path.join(os.path.dirname(os.path.dirname(__file__)), "pathfinding3d", "version.txt"), encoding="utf-8"
+    ) as file_handler:
+        version = file_handler.read().strip()
+
+    assert __version__ == version