Add an error resolution

[soloincc]

Provide a workaround when running gradle for the first time

Closes #

What has been done to verify that this works as intended?

Why is this the best possible solution? Were any other approaches considered?

Are there any risks to merging this code? If so, what are they?

Do we need any specific form for testing your changes? If so, please attach one

Does this change require updates to documentation? If so, please file an issue at https://github.com/opendatakit/docs/issues/new and include the link below.

[ggalmazor]

Hi, @soloincc!

First, let me apologize for the delay of this review.

I think the current instructions give enough information to work around the error you're referring to:

• This error is caused by cloning the repo without having installed git LFS first
• In any case, we don't want devs to use Gradle directly in our projects (as your change suggest). Instead, we want them to use the gradlew wrapper script that is already present in the repo.

Both things are already explained in the docs. Do you feel we should expand on any of those? If not, I'd close this PR without merging.