Adding changelog

Author: fverdugo

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).
+
+## [0.1.0] - Unrelesed
+
+### Added
+
+- Configuration of PETSc installation using Preferences.jl.
+- High-level wrapper of KSP solvers.
+- Support for sequential runs
+- Support for parallel parallel runs with PartitionedArrays.jl
+- Commonly used low-level API for KSP solvers.