docs: Added changelog & readme

CHANGELOG.md

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+# Changelog
+
+## 1.3.0 - Unreleased
+
+### Added
+* Readme and changelog files
+* Error messages to *messages.yml*
+* List messages to *messages.yml*
+
+### Modified
+* Changed java version to java 16
+* Changed spigot version to 1.17.1
+
+### Fixed
+* Sign header color formatting being lost on server restart

README.md

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+# RealEstate
+
+RealEstate is a spigot plugin built on top of GriefPrevention to provide players with an ability to sell, rent and lease claims to other players.
+
+The plugin is documented in the [GitHub wiki](https://github.com/EtienneDx/RealEstate/wiki).
+
+Please feel free to report any issue in the [GitHub Issue section](https://github.com/EtienneDx/RealEstate/issues).
+
+## GriefPrevention
+
+This plugin is dependent on GriefPrevention, which since version 1.3.0 will be included directly within the `RealEstate.jar` file.
+
+The original GriefPrevention plugin can be found [here](https://github.com/TechFortress/GriefPrevention). To make RealEstate possible, I had to implement some modifications to GriefPrevention, which I did in this [fork](https://github.com/EtienneDx/GriefPrevention).
+
+<details>
+    <summary>Code ownership disclaimer</summary>
+    
+    **I AM NOT THE AUTHOR OF *GriefPrevention*, I MERELY MADE A FEW MODIFICATIONS TO IT. I DO NOT CLAIM ANY PROPERTY OVER THE *GriefPrevention* CODE.**
+</details>