Add BUILD files for IMU board

Change-Id: I5437972c594ecd3ebeb24d9b9b96f2801b405021
Signed-off-by: James Kuszmaul <jabukuszmaul+collab@gmail.com>
diff --git a/WORKSPACE b/WORKSPACE
index 3b2eb57..7809594 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -351,6 +351,7 @@
     "//tools/cpp:cc-toolchain-roborio",
     "//tools/cpp:cc-toolchain-cortex-m4f",
     "//tools/cpp:cc-toolchain-rp2040",
+    "//tools/cpp:cc-toolchain-cortex-m4f-imu",
     # Find a good way to select between these two M4F toolchains.
     #"//tools/cpp:cc-toolchain-cortex-m4f-k22",
     "//tools/python:python_toolchain",