feat(yamlreaders): Added __init__.py with get_reader() helper

Exports all readers and provides get_reader() function
that auto-detects file format and returns appropriate reader

yamlreaders/__init__.py

@@ -0,0 +1,24 @@
+from .base import BaseReader, ParseError
+from .yaml_reader import YamlReader
+from .postman_reader import PostmanReader
+from .openapi_reader import OpenAPIReader
+
+
+def get_reader(source: str) -> BaseReader:
+    from pathlib import Path
+
+    path = Path(source)
+
+    if not path.exists():
+        raise FileNotFoundError(f"File not found: {path}")
+
+    with open(path, "r", encoding="utf-8") as f:
+        first_line = f.readline().strip()
+
+    if '"openapi"' in first_line or "openapi:" in first_line:
+        return OpenAPIReader()
+
+    if '"info"' in first_line and '"item"' in first_line:
+        return PostmanReader()
+
+    return YamlReader()