add changelog for major, minor and patch version

CHANGELOG.md

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+# Changelog
+
+## [1.2.0] - 23-08-21
+
+### Feature
+
+- Online/Offline state of all devices on the home page is shown and automatically updated
+- internal changes and enhancements for a better user experience
+
+
+## [1.1.0] - 23-07-05
+
+First feature update which provides easier mac and ip address typing in form fields and some small ui changes and additions
+
+### Feature
+
+- auto delimiters for mac and ip address in form fields
+- discover devices subnet info
+- device info in about screen
+
+
+## [1.0.2] - 23-06-21
+
+### Bugfix
+- fix keyboard glitch
+
+### Feature
+- version info is shown in about screen
+
+
+## [1.0.1] - 23-06-18
+
+###  Bugfix
+
+- keyboard on Add Custom Page now behaves normally instead of disposing as soon as the user pressed on an input field
+- wol packages are now additionally sent as broadcast magic packages
+
+
+## [1.0.0] - 23-06-11
+
+Initial Version of Simple Wake On Lan released! The attached binaries (`.aab` for Android and `.ipa` for iOS) are also the ones uploaded to the Google PlayStore and Apple AppStore respectively. The `.apk` file can be installed directly from here for Android devices.
+
+
+### Feature
+
+- Automatic device discovery
+- Simple interface to send Wake On Lan packets
+- Export and import user data as a `json` file
+
+### Screenshots
+
+|                                          |                                     |
+|:----------------------------------------:|:-----------------------------------:|
+| ![play_integrity](docs/screenshot-1.png) | ![dark_mode](docs/screenshot-2.png) |  
+
+|                                    |                                 |
+|:----------------------------------:|:-------------------------------:|
+| ![settings](docs/screenshot-3.png) | ![about](docs/screenshot-4.png) |