Initial commit

Implement SAFE for field elements:
- Add `Safe` trait
- Add `Sponge` struct
- Add `Error` enum
- Add README
- Add Changelog
- Add documentation
- Add license

.github/workflows/dusk_ci.yml

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+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+name: Continuous integration
+
+jobs:
+  code_analysis:
+    name: Code Analysis
+    uses: dusk-network/.github/.github/workflows/code-analysis.yml@main
+    with:
+      clippy_default: false
+      clippy_args: -- -D warnings
+
+  dusk_analyzer:
+    name: Dusk Analyzer
+    uses: dusk-network/.github/.github/workflows/dusk-analysis.yml@main
+
+  test_nightly:
+    name: Run tests
+    uses: dusk-network/.github/.github/workflows/run-tests.yml@main

.gitignore

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+/target
+**/*.rs.bk
+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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- Add initial implementation of the SAFE framework [#3]
+  - Add `Safe` trait
+  - Add `Sponge` struct
+  - Add `Error` enum
+  - Add README
+  - Add Changelog
+  - Add documentation
+
+<!-- ISSUES -->
+[#3]: https://github.com/dusk-network/safe/issues/3
+
+<!-- VERSIONS -->
+[Unreleased]: https://github.com/dusk-network/poseidon252/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/dusk-network/poseidon252/releases/tag/v0.1.0

Cargo.toml

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+[package]
+name = "dusk-safe"
+version = "0.1.0"
+description = "Sponge API for Field Elements"
+categories = ["algorithms", "cryptography", "no-std"]
+keywords = ["cryptography", "zero-knowledge", "crypto"]
+
+repository = "https://github.com/dusk-network/safe"
+edition = "2021"
+license = "MPL-2.0"
+
+[dependencies]
+zeroize = "1"
+
+[dev-dependencies]
+dusk-bls12_381 = { version = "0.13", default-features = false }
+ff = { version = "0.13", default-features = false }
+rand = { version = "0.8", default-features = false, features = ["getrandom", "std_rng"] }