action to store variables and constraints to read them

[sds100]

Actions

• Set a variable
• Do math (+, -, *, /) on a variable
• Delete a variable

Developer TODO (don't remove)

• [ ] create new branch. put issue number at start of name
• [ ] write tests before working on feature. put issue number in comment
• [ ] update documentation
• [ ] squash and merge
• [ ] delete branch

[GL513]

do you mean a static var, like if 'x' is 'y', or something more fluid, like battery level?

[sds100]

I was just going to do values that the user can input but getting data from external sources could be an idea.