Add git hooks and contributing guide

CONTRIBUTING.md

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+# CONTRIBUTING
+
+Contributions are welcome, and they are greatly appreciated!
+
+1. Fork the `phastft` repository
+2. Clone your fork to your dev machine/environment:
+```bash
+git clone git@github.com:<username>/phastft.git
+```
+3. [Install Rust](https://www.rust-lang.org/tools/install) and setup [nightly](https://rust-lang.github.io/rustup/concepts/channels.html) Rust
+
+4. Setup the git hooks by in your local repo:
+```bash
+cd PhastFT
+git config core.hooksPath ./hooks 
+```
+
+5. When you're done with your changes, ensure the tests pass with:
+```bash
+cargo test --all-features
+```
+
+7. Commit your changes and push them to GitHub
+
+8. Submit a pull request (PR) through the [GitHub website](https://github.com/QuState/phastft/pulls).
+
+## Pull Request Guidelines
+
+Before you submit a pull request, please check the following:
+- The pull request should include tests if it adds and/or changes functionalities.

hooks/pre-commit

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+#!/usr/bin/env bash
+
+set -eu
+
+if ! cargo fmt --all -- --check
+then
+    echo "There are some code style issues."
+    echo "Run cargo fmt first."
+    exit 1
+fi
+
+if ! cargo clippy -- -D warnings
+then
+    echo "There are some clippy issues."
+    exit 1
+fi
+
+if ! cargo test
+then
+    echo "There are some test issues."
+    exit 1
+fi
+
+exit 0