dc/hbj11: init with flasher

This brings in the flashing infrastructure for HBJ11 (bluepill&web).

Change-Id: I480855689f849c24712d58a0ccbce6e91c34f8bd
diff --git a/dc/hbj11/flasher/bluepill/.cargo/config b/dc/hbj11/flasher/bluepill/.cargo/config
new file mode 100644
index 0000000..128b9c4
--- /dev/null
+++ b/dc/hbj11/flasher/bluepill/.cargo/config
@@ -0,0 +1,3 @@
+[build]
+target = "thumbv7m-none-eabi"
+rustflags = [ "-C", "link-arg=-Tlink.x", "-C", "inline-threshold=255"]