feat: starting to build insertion API

src/pinpoint_api/insertions.py

@@ -0,0 +1,26 @@
+from vbl_aquarium.models.unity import Vector3
+from vbl_aquarium.models.pinpoint import InsertionModel
+
+# Coordinates are in (ap, ml, dv)
+# Coordinates are in mm
+
+BREGMA_DICT = {
+    'allen_mouse_25um': Vector3(
+        x = 5.2,
+        y = 5.7,
+        z = 0.33
+    )
+}
+
+class Insertion():
+
+    def __init__(self, atlas: str = 'allen_mouse_25um', transform: str = 'null',
+        entry_coordinate: Vector3 = None, depth: float = None,
+        tip_coordinate: Vector3 = None,
+        angles: Vector3 = None,
+        reference_coordinate: Vector3 = BREGMA_DICT['allen_mouse_25um']):
+        """Create an insertion
+        """
+        pass
+
+    def