chore(exec:pimoroni):Add symlink to enviro-mini pyscript in submod

diff --git a/exec/pimoroni/all-in-one-enviro-mini-bk.py b/exec/pimoroni/all-in-one-enviro-mini-bk.py
new file mode 120000 (symlink)
index 0000000..2711ecb
--- /dev/null
+++ b/exec/pimoroni/all-in-one-enviro-mini-bk.py
@@ -0,0 +1 @@
+../../lib/EVA-2020-02-2..pimoroni_enviroplus-python_bk/examples/all-in-one-enviro-mini-bk.py
\ No newline at end of file