Documentation update

[Nikhilkapoor20]

Bypass the directive in unit test cases

[codecov-io]

Codecov Report

Merging #57 into master will decrease coverage by 0.25%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
- Coverage   97.53%   97.28%   -0.26%     
==========================================
  Files          16       16              
  Lines         527      515      -12     
  Branches       96       96              
==========================================
- Hits          514      501      -13     
- Misses          1        2       +1     
  Partials       12       12

Impacted Files	Coverage Δ
...permissions/src/lib/service/permissions.service.ts	100% <ø> (ø)
.../ngx-permissions/src/lib/model/permission.model.ts	100% <ø> (ø)
...issions/src/lib/directive/permissions.directive.ts	92.24% <ø> (ø)
projects/ngx-permissions/src/lib/utils/utils.ts	100% <ø> (ø)
...s/ngx-permissions/src/lib/service/roles.service.ts	100% <ø> (ø)
...ssions/src/lib/router/permissions-guard.service.ts	100% <ø> (ø)
...x-permissions/src/lib/store/configuration.store.ts	100% <ø> (ø)
...ssions/src/lib/enums/predefined-strategies.enum.ts	100% <ø> (ø)
...lib/testing/permissions-restrict.directive.stub.ts	100% <ø> (ø)
...rc/lib/testing/permissions-allow.directive.stub.ts	95.45% <ø> (ø)
... and 16 more

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[AlexKhymenko]

Thank You for the pull request. But im planning to leave only wiki page.