docs: add CHANGELOG.md for version tracking

Author: medeirosdev

CHANGELOG.md

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+# Changelog
+
+All notable changes to TrueEntropy 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).
+
+## [0.1.0] - 2025-12-27
+
+### Added
+
+#### Core Features
+- `EntropyPool` - Thread-safe entropy accumulator with SHA-256 mixing
+- `EntropyTap` - Extractor for converting entropy to random values
+- `entropy_health()` - Pool health monitoring with score and recommendations
+
+#### Random Generation
+- `random()` - Float in [0.0, 1.0)
+- `randint(a, b)` - Integer in [a, b] with rejection sampling
+- `randbool()` - Random boolean
+- `choice(seq)` - Random element from sequence
+- `randbytes(n)` - Random bytes
+- `shuffle(seq)` - Fisher-Yates shuffle
+- `sample(seq, k)` - Random sampling without replacement
+
+#### Distributions
+- `uniform(a, b)` - Uniform distribution
+- `gauss(mu, sigma)` - Normal distribution (Box-Muller)
+- `triangular(low, high, mode)` - Triangular distribution
+- `exponential(lambd)` - Exponential distribution
+- `weighted_choice(seq, weights)` - Weighted random selection
+
+#### Generators
+- `random_uuid()` - UUID v4 generation
+- `random_token(length, encoding)` - Hex/base64 tokens
+- `random_password(length, ...)` - Secure password generation
+
+#### Entropy Harvesters
+- `TimingHarvester` - CPU timing jitter
+- `NetworkHarvester` - Network latency measurements
+- `SystemHarvester` - System state (RAM, CPU, processes)
+- `ExternalHarvester` - USGS earthquakes, crypto prices
+- `WeatherHarvester` - OpenWeatherMap/wttr.in weather data
+- `RadioactiveHarvester` - random.org and ANU QRNG
+
+#### Advanced Features
+- `trueentropy.aio` - Async/await support
+- `trueentropy.persistence` - Save/load pool state
+- `trueentropy.pools` - Multiple isolated pools
+- `trueentropy.lazy` - Lazy harvester loading
+- `trueentropy.accel` - Optional Cython acceleration
+
+#### Infrastructure
+- GitHub Actions CI (tests on Python 3.9-3.12, Linux/Windows/macOS)
+- Comprehensive test suite (100+ tests)
+- Type hints (PEP 561 compliant)
+- Documentation (README, REFERENCES)
+
+### Dependencies
+- `requests>=2.25.0`
+- `psutil>=5.8.0`
+
+[0.1.0]: https://github.com/medeirosdev/TrueEntropy-PyLib/releases/tag/v0.1.0