Add RSR script for MERSI-3 onboard FY-3F

[simonrp84]

As it says on the tin, this adds a conversion script to generate the RSR file for MERSI-3 onboard FY-3F.

[adybbroe]

Thanks @simonrp84
I was going to try see if I could run it. But I fail downloading the origonal RSR data from the site you pointed to. I get "Secure Connection Failed". Are you able to get the data from there atm?

[adybbroe]

@simonrp84 In the mean time could you merge main into this, so we can get the CI failures fixed?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.82%. Comparing base (239c410) to head (102a19f).
Report is 36 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #226   +/-   ##
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  Coverage   89.82%   89.82%           
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  Files          23       23           
  Lines        2535     2535           
=======================================
  Hits         2277     2277           
  Misses        258      258           

Flag	Coverage Δ
unittests	89.82% <100.00%> (ø)

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[yukaribbba]

@simonrp84 @adybbroe Try this one http://satellite.nsmc.org.cn/PortalSite/StaticContent/FileDownload.aspx?CategoryID=1&LinkID=1017

[adybbroe]

LGTM