Add outside of a route example

[jonra1993]

This PR adds some comments on documentation so developers can know how to use db context outside of a route.

[codecov[bot]]

Codecov Report

Merging #6 (e026942) into main (0087b9f) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main        #6   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            3         3           
  Lines           68        68           
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  Hits            68        68           

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[h0rn3t]

thanks