add clone instructions

[bobturneruk]

Resolves ScottishCovidResponse/SCRCIssueTracking#760

Also checks if the CI is still working :)

[codecov]

Codecov Report

Merging #130 (4d93ad5) into master (62c4571) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #130   +/-   ##
=======================================
  Coverage   94.44%   94.44%           
=======================================
  Files           8        8           
  Lines        1080     1080           
=======================================
  Hits         1020     1020           
  Misses         60       60           

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[bobturneruk]

Apologies for the world's most boring PR.