Welsh example

[apmoore1]

Adds the following:

• A mapping from the basic CorCenCC POS tagset to USAS core POS tagset.
• The usage documentation, for the "How-to Tag Text", has been updated so that it includes a Welsh example which does not use spaCy, instead uses the CyTag toolkit.

Creating a new release

I think once this has been added to the main branch we should create a new release, e.g. 0.2.0 as the new release will contain the following two POS mappings:

1. A mapping from the basic CorCenCC POS tagset to USAS core POS tagset.
2. A mapping from the Penn Chinese Treebank POS tagset to USAS core POS tagset.

What do you think @perayson ?

[codecov-commenter]

Codecov Report

Merging #23 (e6efe4a) into main (854bce6) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #23   +/-   ##
=======================================
  Coverage   97.61%   97.62%           
=======================================
  Files           8        8           
  Lines         336      337    +1     
  Branches       66       66           
=======================================
+ Hits          328      329    +1     
  Misses          7        7           
  Partials        1        1           

Impacted Files	Coverage Δ
pymusas/pos_mapper.py	100.00% <100.00%> (ø)

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[perayson]

Thanks, this all looks great to me, and I agree about a new release. Will that trigger an update on the pip installable version?