update readme with installation steps

[SimonLab]

ref: #78 add dwylbot installation steps to the Readme

[codecov[bot]]

Codecov Report

Merging #100 into master will increase coverage by 1.31%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #100      +/-   ##
==========================================
+ Coverage   96.11%   97.43%   +1.31%     
==========================================
  Files          19       20       +1     
  Lines         103      156      +53     
==========================================
+ Hits           99      152      +53     
  Misses          4        4

Impacted Files	Coverage Δ
web/controllers/rules/issue/no_description.ex	100% <0%> (ø)	:arrow_up:
web/controllers/rules/list_rules.ex	100% <0%> (ø)	:arrow_up:
web/controllers/rules/helpers.ex	100% <0%> (ø)	:arrow_up:
web/controllers/processes/wait.ex	100% <0%> (ø)	:arrow_up:
web/controllers/rules/pr/no_description.ex	100% <0%> (ø)	:arrow_up:
web/controllers/rules/issue/noassignees.ex	100% <0%> (ø)	:arrow_up:
web/controllers/rules/issue/time_estimation.ex	100% <0%> (ø)	:arrow_up:
web/controllers/github_api/in_memory.ex	100% <0%> (ø)	:arrow_up:
web/controllers/rules/issue/inprogress.ex	100% <0%> (ø)	:arrow_up:
web/controllers/rules/pr/merge_conflict.ex	100% <0%> (ø)

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[naazy]

Have just installed and the instructions were super easy and clear :smile:

🤖

[nelsonic]

@naazy thanks for confirming! 🎉