Add tests and docs for Payload component

docs/Components/Auxiliary/Payload.md

@@ -0,0 +1,23 @@
+# Payload
+
+Payload is a class created to act as a variable-mass container. Currently it is simple an AttachedComponent with the type 'payload'. 
+
+## Instantiation
+To instantiate a Payload one can pass the same arguments used to instantiate an AttachedComponent:
+
+``` python
+import math
+from vec import Vector2
+
+from adr.Components.Auxiliary import Payload
+
+main_payload = Payload(
+    name='main_payload',
+    mass=9.2,
+    relative_position=Vector2(-0.2, 0),
+    relative_angle=math.radians(0)
+)
+
+print(main_payload.type)
+>>> payload
+```

mkdocs.yml

@@ -9,6 +9,7 @@ nav:
             AttachedComponent: Components/AttachedComponent.md
             Auxiliary:
                 LandingGear: Components/Auxiliary/LandingGear.md
+                Payload: Components/Auxiliary/Payload.md
         World:
             Ambient: World/Ambient.md
             constants: World/constants.md

tests/Components/Auxiliary/test_Payload.py

@@ -0,0 +1,20 @@
+import pytest
+import math
+from vec import Vector2
+
+from adr.Components.Auxiliary import Payload
+
+
+@pytest.fixture
+def main_payload():
+    main_payload = Payload(
+        name='main_payload',
+        mass=9.2,
+        relative_position=Vector2(-0.2, 0),
+        relative_angle=math.radians(0)
+    )
+    return main_payload
+
+
+def test_instantiation(main_payload):
+    assert(main_payload.type == 'payload')