add note about setting types in tsconfig file

[tjenkinson]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:

• remove @types/node dependency #3226

Description

This adds a note about setting the types field in the typescript config file, to prevent the @types/node types automatically being included.

Feel free to change it

[codecov]

Codecov Report

Merging #3300 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3300   +/-   ##
=======================================
  Coverage   93.12%   93.12%           
=======================================
  Files         170      170           
  Lines        5967     5967           
  Branches     1780     1780           
=======================================
  Hits         5557     5557           
  Misses        219      219           
  Partials      191      191

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[lukastaegert]

Very good, thanks a lot!