Added RFC definitions as comments to tests

- To help out folks like @zosman who might want to contribute,
  I've gone ahead and pulled out the definitions for tested
  components and put their ABNF definitions along with its page
  number from the RFC document.
1 job for 4-start-anew in 14 seconds (queued for 2 seconds)
Name Stage Failure
test_lib-ical Test There is an unknown failure, please try again
      at Parameter.set paramValues [as paramValues] (src/Parameter.ts:89:19)
at new Parameter (src/Parameter.ts:36:25)
at (test/Parameter.spec.ts:44:46)

npm info lifecycle lib-ics@0.0.1~test: Failed to exec test script
npm ERR! Test failed. See above for more details.
ERROR: Build failed: exit code 1