Add Quality of a (text) file's content, closes #114

[codecov-commenter]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (f2825b4) 97.09% compared to head (c6ab57c) 97.13%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #118 +/- ## ============================================ + Coverage 97.09% 97.13% +0.04% - Complexity 643 649 +6 ============================================ Files 172 173 +1 Lines 1409 1431 +22 Branches 47 48 +1 ============================================ + Hits 1368 1390 +22 Misses 35 35 Partials 6 6 ``` | [Files](https://app.codecov.io/gh/saynotobugsorg/confidence/pull/118?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [...notobugs/confidence/quality/file/ContainsText.java](https://app.codecov.io/gh/saynotobugsorg/confidence/pull/118?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-Y29uZmlkZW5jZS1jb3JlL3NyYy9tYWluL2phdmEvb3JnL3NheW5vdG9idWdzL2NvbmZpZGVuY2UvcXVhbGl0eS9maWxlL0NvbnRhaW5zVGV4dC5qYXZh) | `100.00% <100.00%> (ø)` | |

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