added readme + added changelog (#3)

* added readme + added changelog

* Rename back license file

---------

Co-authored-by: Sergey Shorokhov <wopox1337@ya.ru>

CHANGELOG.md

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+# [rechecker](https://github.com/rehlds/rechecker) Changelog
+
+---
+
+## [`2.7`](https://github.com/rehlds/rechecker/releases/tag/2.7) - 2021-06-15
+
+### Added
+- Added the keyword `'[id]'` to obtain the player's index.
+
+### Fixed
+- Fixed a bug with ConVars when unloading the plugin.
+
+**Full Changelog**: [2.5...2.7](https://github.com/rehlds/rechecker/compare/2.5...2.7)
+
+## [`2.5`](https://github.com/rehlds/rechecker/releases/tag/2.5) - 2017-10-25
+
+### Fixed
+- Fixed Bad file if `gamedll` doesn't check its own original files. 
+  - Critical for `HL` with `mp_consistency` enabled.
+  - Thank you to user [Asdnn](http://aghl.ru/forum/viewtopic.php?f=10&t=2796#p29278)
+- `Rechecker API`: Minor issues fixed.
+
+**Full Changelog**: [2.4...2.5](https://github.com/rehlds/rechecker/compare/2.4...2.5)
+
+## [`2.4`](https://github.com/rehlds/rechecker/releases/tag/2.4) - 2017-09-24
+
+### Added
+- `UTF-8 BOM` support added for `resources.ini`
+
+### Fixed
+- Some minor bugs fixed
+
+## Changed
+- Removed file extension check for the requested file
+- `Rechecker API` updated to `2.1`
+
+**Full Changelog**: [2.3...2.4](https://github.com/rehlds/rechecker/compare/2.3...2.4)
+
+## [`2.3`](https://github.com/rehlds/rechecker/releases/tag/2.3) - 2017-01-22
+
+### Added
+- Initial release
+
+**Full Changelog**: [2.3](https://github.com/rehlds/rechecker/commits/2.3)

LICENSE

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+MIT License
+
+Copyright (c) 2014-2016 s1lentq, 2016-2024 reHLDS
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+## [rechecker](https://github.com/rehlds/rechecker) [![Percentage of issues still open](http://isitmaintained.com/badge/open/rehlds/rechecker.svg)](http://isitmaintained.com/project/rehlds/rechecker "Percentage of issues still open") [![GitHub license](https://img.shields.io/github/license/rehlds/rechecker.svg?longCache=true&style=flat-square)](https://github.com/rehlds/rechecker/blob/master/LICENSE.md)  [![GitHub issues](https://img.shields.io/github/issues/rehlds/rechecker.svg?longCache=true&style=flat-square)](https://github.com/rehlds/rechecker/issues) [![GitHub forks](https://img.shields.io/github/forks/rehlds/rechecker.svg?longCache=true&style=flat-square)](https://github.com/rehlds/rechecker/network) [![GitHub stars](https://img.shields.io/github/stars/rehlds/rechecker.svg?longCache=true&style=flat-square)](https://github.com/rehlds/rechecker/stargazers)