add manifest.in

[looooo]

if the workbench is installed via pip (pip install git+https://github.com/jpmlt/freecad-cadquery2-workbench) the templates and iconds are missing. Adding a MANIFEST.in solves this issue

no idea why I am not able to create a PR, but here is the diff:

commit c18b0f90ce5d9ff75bd690ee720dbf6695e3b42d (HEAD -> master, origin/master, origin/HEAD)
Author: lorenz <[email protected]>
Date:   Sat Dec 30 14:15:56 2023 +0100

    Create MANIFEST.in

diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..5872974
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1,2 @@
+recursive-include freecad/cadquery2workbench/resources *
+recursive-include freecad/cadquery2workbench/templates *
(END)