feat: add support for did ethr

[vasa-develop]

This may require a bit of cleanup.

Added:

• support for did ethr
• an error type

License: MIT
Signed-off-by: Vaibhav Saini [email protected]

[codecov-io]

Codecov Report

Merging #3 into master will increase coverage by 3.16%.
The diff coverage is 28%.

@@           Coverage Diff           @@
##           master    #3      +/-   ##
=======================================
+ Coverage    6.83%   10%   +3.16%     
=======================================
  Files           4     4              
  Lines         117   140      +23     
  Branches       18    22       +4     
=======================================
+ Hits            8    14       +6     
- Misses         91   105      +14     
- Partials       18    21       +3

Impacted Files	Coverage Δ
src/errors.js	0% <0%> (ø)	⬆️
src/did-resolver.js	22.85% <29.16%> (+7.47%)	⬆️

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[vasa-develop]

Going forward, we should add some more tests.