Create .gitignore across repositories with Sync Action

[facusapienza21]

I think it will be a good idea to have a .gitignore synchronize between all the ODINN family repositories. We can use this example as an starting point:

# Files generated by invoking Julia with --code-coverage
*.jl.cov
*.jl.*.cov

# Files generated by invoking Julia with --track-allocation
*.jl.mem

# System-specific files and directories generated by the BinaryProvider and BinDeps packages
# They contain absolute paths specific to the host computer, and so should not be committed
deps/deps.jl
deps/build.log
deps/downloads/
deps/usr/
deps/src/

# Build artifacts for creating documentation generated by the Documenter package
docs/build/
docs/site/

# File generated by Pkg, the package manager, based on a corresponding Project.toml
# It records a fixed state of all packages used by the project. As such, it should not be
# committed for packages, but should be committed for applications that require a static
# environment.
Manifest.toml

and maybe add the *.core that sometimes are created when running code in parallel.

Any thoughts on this @JordiBolibar ?

[JordiBolibar]

@facusapienza21 I have seen some changes related to this in my emails during my holidays. I just wanted to double check if this can be closed now.