Add README.md

Author: 98teg

README.md

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+![JSON Configuration File Banner](./doc/images/json_configuration_file_banner.png)
+
+# JSON Configuration File
+
+JSON Configuration File is a plugin for Godot that aims to aid reading user input via a JSON file. Using a JSON file as a way to configure your Godot application would allow your users to share configuration files. Minecraft is a remarkable example that uses JSON files to configure certain aspects of the game, such as block models.
+
+The definition of JSON Schemas inspired this plugin. However, instead of using a JSON file to define the structure of a JSON, it takes a coding approach. This approach has the advantage of allowing more features.
+
+## Code example
+
+When using this plugin, you would be able to set up a configuration file with code like this:
+![Code example](./doc/images/code_example.png)
+This code would verify that this JSON file is valid:
+![Valid JSON](./doc/images/valid_json.png)
+And it would also detect multiple errors in this JSON file with a single validation process:
+![Incorrect JSON](./doc/images/incorrect_json.png)
+Please, check the [documentation](./doc/README.md) to learn how to set up your own JSON configuration file.
+
+## Features
+
+This plugin would offer you:
+- Twelve different types of properties:
+    - Booleans
+    - Real numbers
+    - Integers
+    - Percentages
+    - Strings
+    - Enums
+    - Arrays
+    - Colors
+    - Objects
+    - Files
+    - JSON Configuration Files
+    - Images
+- The ability to detect multiple errors and warnings with a single call to the validation process.
+- A representation of the errors and warnings with dictionaries to allow customization of the messages.
+- The execution of code during the validation process to transform the data or to create custom tests.
+
+## Contributing
+
+If you want to contribute with a new kind of property or a new feature, please consider also contributing to the [documentation](./doc/README.md) and adding new tests to the [repository of tests](https://github.com/98teg/JSONConfigFileTests) for this plugin.