introduced CHANGELOG.md

- fix #16

CHANGELOG.md

@@ -0,0 +1,103 @@
+# Change Log
+All notable changed to this project will be documented in this file.
+
+## [1.1.71] - 08.2020
+### Added
+- CHANGELOG.md
+### Changed
+- README.md
+- Referenced changelog into nuget release notes
+### Fixed
+
+## [1.1.69] - 11.06.2020
+### Added
+### Changed
+- README.md
+### Fixed
+
+## [1.1.68] - 11.06.2020
+### Added
+- Added enums and methods overloads for S7Wordlength and S7Area (#11)
+### Changed
+- README.md
+- Changed properties to expression body solution wide
+- Changed S7 calls to extension methods
+- Usage of overloaded methods with enums instead of constants
+### Fixed
+- Check connection on socket close
+- Null propagation on disconnect method
+- Soved usage ob obsolete constants
+
+## [1.1.63] - 06.05.2020
+### Added
+### Changed
+### Fixed
+- style and security enhancement
+
+## [1.1.62] - 06.05.2020
+### Added
+### Changed
+### Fixed
+- Unused exception handling
+
+## [1.1.61] - 06.05.2020
+### Added
+### Changed
+### Fixed
+- Usage of Timeouts from [philfontaine/Sharp7@fb01cc0](https://github.com/philfontaine/Sharp7@fb01cc0)
+
+## [1.1.60] - 06.05.2020
+### Added
+### Changed
+### Fixed
+- connection check into overload of SendPacket (#8)
+
+## [1.1.59] - 06.05.2020
+### Added
+- Added unit tests
+### Changed
+- Created extension methods from S7
+### Fixed
+- Fixed naming rules
+
+## [1.0.50] - 17.11.2019
+### Added
+### Changed
+- README.md
+### Fixed
+
+## [1.0.49] - 17.11.2019
+### Added
+### Changed
+- README.md
+### Fixed
+
+## [1.0.48] - 17.11.2019
+### Added
+### Changed
+- README.md
+### Fixed
+
+## [1.0.25] - 02.04.2019
+### Added
+- Added nuget package description
+### Changed
+### Fixed
+
+## [1.0.22] - 17.01.2019
+### Added
+- Added debug symbols to Nuget
+### Changed
+### Fixed
+
+## [1.0.18] - 21.11.2018
+### Added
+### Changed
+- Migrate solution to project SDK (#2)
+### Fixed
+
+## [1.0.0] - 21.01.2018
+### Added
+- imported initial project from source forge
+### Changed
+### Fixed