Added link to excelparser from tools for documentation of excel sheet.

[francescalb]

Description:

The tool page for the excelparser has very little documentation on the required structure of the excelsheet.
It is important to not have several places with documentation what might diverge in the future so only a link is added to the tools readme.

Type of change:

• Bug fix.
• New feature.
• Documentation update.

Checklist:

This checklist can be used as a help for the reviewer.

• Is the code easy to read and understand?
• Are comments for humans to read, not computers to disregard?
• Does a new feature has an accompanying new test (in the CI or unit testing schemes)?
• Has the documentation been updated as necessary?
• Does this close the issue?
• Is the change limited to the issue?
• Are errors handled for all outcomes?
• Does the new feature provide new restrictions on dependencies, and if so is this documented?

Comments:

[codecov]

Codecov Report

Merging #594 (d52ddb4) into master (c1137b7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #594   +/-   ##
=======================================
  Coverage   67.25%   67.25%           
=======================================
  Files          16       16           
  Lines        3127     3127           
=======================================
  Hits         2103     2103           
  Misses       1024     1024           

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[jesper-friis]

I approve since It make no sense to delay merging this into master.

However, it may still be useful to extend this documentation with a tutorial with screenshots of the different tabs and a short description of what the user is supposed to fill it in.

It can be followed up with the current example