Prepare for v0.1.2 Release

[masa10-f]

Before submitting, please check the following:

• Make sure you have tests for the new code and that test passes (run pytest)
• If applicable, add a line to the [unreleased] part of CHANGELOG.md, following keep-a-changelog.
• Format added code by ruff
• Type checking by mypy and pyright
• Make sure the checks (github actions) pass.
• Check that the docs compile without errors (run make html in ./docs/ - you may need to install dependency for sphinx docs, see docs/requirements.txt.)

Then, please fill in below:

Description of the change:

Prepared a release for v0.1.2
I also added a coverage badge to the README.

Related issue:

NA

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.35%. Comparing base (afd80b7) to head (334d684).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #122   +/-   ##
=======================================
  Coverage   68.35%   68.35%           
=======================================
  Files          21       21           
  Lines        2035     2035           
  Branches      326      326           
=======================================
  Hits         1391     1391           
  Misses        592      592           
  Partials       52       52           

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• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[masa10-f]

We will publish v0.1.2 after #121 and #127 are merged.