build: add bootstap task

tasks.py

@@ -2,9 +2,21 @@
 
 __import__("sys").path.append("src")  # noqa
 
+import shutil
+import sys
+
 import swydd as s
 
 
+@s.task
+def bootstrap():
+    """setup swydd dev environment"""
+    if not shutil.which("pdm"):
+        sys.exit("pdm necessary for swydd development")
+    s.sh("pdm install")
+    s.sh("pdm run pre-commit install")
+
+
 @s.task
 @s.option("types", "also run mypy")
 def check(types: bool = False):