Added README, License, Contribution information

+ added GitHub build action
tlsnotary/tlsn#266

.github/workflows/rust.yml

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+name: Rust
+
+on:
+  push:
+    branches: [dev]
+  pull_request:
+    branches: [dev]
+
+env:
+  CARGO_TERM_COLOR: always
+  CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
+
+jobs:
+  build_and_test:
+    if: ( ! github.event.pull_request.draft )
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Stable
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+      - uses: Swatinem/rust-cache@v2.0.0
+
+      - name: "Build"
+        run: cargo build
+
+      - name: "Test"
+        run: cargo test --lib --bins --tests --examples --workspace
+
+      - name: "Check documentation"
+        env:
+          RUSTDOCFLAGS: -D warnings
+        run: cargo doc --no-deps --document-private-items --all-features --workspace --examples
+
+  rustfmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Nightly with rustfmt
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly
+          components: rustfmt
+
+      - name: "Check formatting"
+        run: cargo +nightly fmt --check --all

.gitignore

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+/target
+.cargo-ok
+.DS_Store
+
+Cargo.lock

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]

CONTRIBUTING.md

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+# Contribution guidelines
+
+First off, thank you for contributing to tlsn-utils.
+
+If your contribution is not straightforward, please first discuss the change you
+wish to make by creating a new issue.
+
+## Reporting issues
+
+Before reporting an issue on the
+[issue tracker](https://github.com/tlsnotary/tlsn-utils/issues),
+please check that it has not already been reported by searching for some related
+keywords.
+
+## Pull requests
+
+Try to do one pull request per change.
+
+### Updating the changelog
+
+Update the changes you have made in
+[CHANGELOG](CHANGELOG.md)
+file under the **Unreleased** section.
+
+Add the changes of your pull request to one of the following subsections,
+depending on the types of changes defined by
+[Keep a changelog](https://keepachangelog.com/en/1.0.0/):
+
+- `Added` for new features.
+- `Changed` for changes in existing functionality.
+- `Deprecated` for soon-to-be removed features.
+- `Removed` for now removed features.
+- `Fixed` for any bug fixes.
+- `Security` in case of vulnerabilities.
+
+If the required subsection does not exist yet under **Unreleased**, create it!

README.md

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+[![CI](https://github.com/tlsnotary/tlsn-utils/actions/workflows/rust.yml/badge.svg)](https://github.com/tlsnotary/tlsn-utils/actions)
+
+<p align="center">
+    <img src="./tlsn-banner.png" width=1280 />
+</p>
+
+# TLSNotary Utils
+
+Utility functions which are used for the development of [TLSNotary](https://github.com/tlsnotary/tlsn)
+
+## ⚠️ Notice
+
+This project is currently under active development and should not be used in production. Expect bugs and regular major breaking changes.
+
+## License
+All crates in this repository are licensed under either of
+
+- [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
+- [MIT license](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.
+
+See [CONTRIBUTING.md](CONTRIBUTING.md).