review index page
review quickstart
Merge pull request #147 from nilquebe/review_index

docs/index.mdのレビュー
Merge pull request #148 from nilquebe/review_quickstart

review quickstart
error message for file not found
Add create_issue task
Remove compare_docs task. ref #139
Add dotenv gem
accept USERNAME and PASSWORD instead of TOKEN
resolve conflict
add a issue template for file removing
Merge branch 'create-issue-task' into test-diff
add file for remarking its removal