Added new icon in tree view resource

[sudhirverma]

[codecov-io]

Codecov Report

Merging #191 into master will increase coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #191      +/-   ##
==========================================
+ Coverage   73.41%   73.44%   +0.02%     
==========================================
  Files          33       33              
  Lines        1892     1894       +2     
  Branches      292      293       +1     
==========================================
+ Hits         1389     1391       +2     
  Misses        503      503

Impacted Files	Coverage Δ
src/tkn.ts	77.46% <ø> (ø)	⬆️
src/pipeline/preview.ts	15.49% <0%> (ø)	⬆️
src/tools.ts	94.56% <0%> (+0.12%)	⬆️

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[evidolob]

New images doesn't work for pipeline preview:

General look:

But with zoom-in new icons become unreadable:

Note: I use 'Tekton' svg as sample that other svg works fine

[evidolob]

Patch to test preview with new icons https://gist.github.com/evidolob/40a90c1bdd77dba72743d362b7ac0ac3

[sudhirverma]

@evidolob & @siamaksade

[evidolob]

It works as expected.
Please delete unused resources(png/svg), to make repository clear

[evidolob]

@sudhirverma Please add icon description in README.md https://github.com/redhat-developer/vscode-tekton#icons-representation