Add shooter interpolation

Includes interpolation values based on testing for at-home challenges
from
https://docs.google.com/document/d/1NR9F-ntlSoqZ9LqDzLjn-c14t8ZrppawCCG7wQy47RU/edit

Change-Id: I094242f43f22da7602f60557a0ec2865a4066875
diff --git a/y2020/BUILD b/y2020/BUILD
index 90d976b..964def4 100644
--- a/y2020/BUILD
+++ b/y2020/BUILD
@@ -65,6 +65,7 @@
         "//aos/stl_mutex",
         "//frc971:constants",
         "//frc971/control_loops:static_zeroing_single_dof_profiled_subsystem",
+        "//frc971/shooter_interpolation:interpolation",
         "//y2020/control_loops/drivetrain:polydrivetrain_plants",
         "//y2020/control_loops/superstructure/accelerator:accelerator_plants",
         "//y2020/control_loops/superstructure/control_panel:control_panel_plants",