chore: adding license footers to code (#22)

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (44b10de) 83.63% compared to head (384e816) 83.63%.

:exclamation: Current head 384e816 differs from pull request most recent head fd3e6a7. Consider uploading reports for the commit fd3e6a7 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #23 +/- ## ======================================= Coverage 83.63% 83.63% ======================================= Files 17 17 Lines 6085 6085 ======================================= Hits 5089 5089 Misses 996 996 ``` | [Impacted Files](https://codecov.io/gh/bihealth/hgvs-rs/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth) | Coverage Δ | | |---|---|---| | [src/data/interface.rs](https://codecov.io/gh/bihealth/hgvs-rs/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth#diff-c3JjL2RhdGEvaW50ZXJmYWNlLnJz) | `100.00% <ø> (ø)` | | | [src/data/uta.rs](https://codecov.io/gh/bihealth/hgvs-rs/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth#diff-c3JjL2RhdGEvdXRhLnJz) | `93.35% <ø> (ø)` | | | [src/data/uta\_sr.rs](https://codecov.io/gh/bihealth/hgvs-rs/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth#diff-c3JjL2RhdGEvdXRhX3NyLnJz) | `50.60% <ø> (ø)` | | | [src/mapper/alignment.rs](https://codecov.io/gh/bihealth/hgvs-rs/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth#diff-c3JjL21hcHBlci9hbGlnbm1lbnQucnM=) | `91.08% <ø> (ø)` | | | [src/mapper/altseq.rs](https://codecov.io/gh/bihealth/hgvs-rs/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth#diff-c3JjL21hcHBlci9hbHRzZXEucnM=) | `90.43% <ø> (ø)` | | | [src/mapper/variant.rs](https://codecov.io/gh/bihealth/hgvs-rs/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth#diff-c3JjL21hcHBlci92YXJpYW50LnJz) | `70.08% <ø> (ø)` | | | [src/normalizer.rs](https://codecov.io/gh/bihealth/hgvs-rs/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth#diff-c3JjL25vcm1hbGl6ZXIucnM=) | `67.86% <ø> (ø)` | | | [src/parser/display.rs](https://codecov.io/gh/bihealth/hgvs-rs/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth#diff-c3JjL3BhcnNlci9kaXNwbGF5LnJz) | `84.65% <ø> (ø)` | | | [src/parser/ds.rs](https://codecov.io/gh/bihealth/hgvs-rs/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth#diff-c3JjL3BhcnNlci9kcy5ycw==) | `62.77% <ø> (ø)` | | | [src/parser/impl\_parse.rs](https://codecov.io/gh/bihealth/hgvs-rs/pull/23?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth#diff-c3JjL3BhcnNlci9pbXBsX3BhcnNlLnJz) | `99.28% <ø> (ø)` | | | ... and [5 more](https://codecov.io/gh/bihealth/hgvs-rs/pull/23?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth) | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bihealth)

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