chore: moved files from mail-codec to own crate

Author: rustonaut

.gitignore

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+/target
+Cargo.lock
+.idea/
+.vscode/
+*.iml
+**/*.rs.bk

Cargo.toml

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+[package]
+authors = ["Philipp Korber <[email protected]>"]
+categories = []
+description = "TODO"
+documentation = "https://docs.rs/vec1"
+keywords = ["vec", "min", "length", "1"]
+license = "MIT OR Apache-2.0"
+name = "vec1"
+readme = "./README.md"
+repository = "https://github.com/1aim/mail-codec/"
+version = "0.1.0"
+
+[dependencies]
+

README.md

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+
+# vec1
+
+**TODO**
+
+---
+
+TODO
+
+
+TODO: Documentation can be [viewed on docs.rs](https://docs.rs/vec1).
+
+
+## License
+
+Licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](../LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](../LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any
+additional terms or conditions.