Display param descriptions in start pipeline and add trigger.

[sudhirverma]

Fix: #413

[codecov-io]

Codecov Report

Merging #465 (97fc314) into master (8cc7bd0) will increase coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #465      +/-   ##
==========================================
+ Coverage   67.40%   67.42%   +0.01%     
==========================================
  Files          74       74              
  Lines        4915     4927      +12     
  Branches      867      869       +2     
==========================================
+ Hits         3313     3322       +9     
- Misses       1602     1605       +3     

Impacted Files	Coverage Δ
src/tekton/addtrigger.ts	80.30% <0.00%> (-1.24%)	⬇️
src/tekton/webviewstartpipeline.ts	97.22% <87.50%> (-2.78%)	⬇️
src/tkn.ts	66.71% <100.00%> (+0.08%)	⬆️

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