feat: net5.0 and move to github actions

[guitarrapc]

TL;DR

support .NET 5.

[codecov]

Codecov Report

Merging #23 (4b80466) into master (413b1ae) will decrease coverage by 47.43%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master      #23       +/-   ##
===========================================
- Coverage   75.78%   28.35%   -47.44%     
===========================================
  Files          15       19        +4     
  Lines         983    47705    +46722     
===========================================
+ Hits          745    13527    +12782     
- Misses        238    34178    +33940     

Flag	Coverage Δ
unittests	28.35% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...rp.Parser/Parsers/MySql/MySqlParserBaseListener.cs	12.68% <0.00%> (ø)
...c/MySQLToCsharp.Parser/Parsers/MySql/MySqlLexer.cs	99.88% <0.00%> (ø)
.../MySQLToCsharp.Parser/Parsers/MySql/MySqlParser.cs	16.58% <0.00%> (ø)
...arp.Parser/Parsers/MySql/MySqlParserBaseVisitor.cs	0.00% <0.00%> (ø)

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[guitarrapc]

closed #22