Added a testplan folder in docs, with a README and TEMPLATE for testplan
We want community involvement with testplans, since we believe that testplans written as early as possible before implementation starts work like a checklist and as soon as we finish the implementation we can compare it to the test plan to check for any bugs. Also even before implementation is finished, if a developer can read a test plan beforehand they can prevent most bugs, hence why we believe that the earlier we write a test plan the more bugs we can prevent.
Co-authored-by: Igor <38665104+ihaid@users.noreply.github.com>