feat: crypto endpoint

[alexbarnsley]

A summary of what changes this PR introduces and why they were made.

What kind of change does this PR introduce?

• Bugfix
• Feature
• Refactor
• Performance
• Tests
• Build
• Documentation
• Code style update
• Continuous Integration
• Other, please describe:

Does this PR introduce a breaking change?

• Yes
• No

Does this PR release a new version?

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• It's submitted to the develop branch, not the master branch
• All tests are passing
• New/updated tests are included

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

[codecov-io]

Codecov Report

Merging #54 into master will increase coverage by 0.21%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #54      +/-   ##
==========================================
+ Coverage   74.35%   74.57%   +0.21%     
==========================================
  Files          12       12              
  Lines         117      118       +1     
  Branches       10       10              
==========================================
+ Hits           87       88       +1     
  Misses         30       30

Impacted Files	Coverage Δ
src/resources/node.ts	100% <100%> (ø)	⬆️

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