docs: add usage instructions

Author: devsheva

README.md

@@ -1,14 +1,54 @@
-# simplelog
+# simplelog-decorator
 
 ![GitHub Actions Workflow Status](https://img.shields.io/github/actions/workflow/status/devsheva/simplelog/qa.yml)
 [![NPM Version](https://img.shields.io/npm/v/simplelog-decorator)](https://www.npmjs.com/package/simplelog-decorator)
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-A simple logger decorator amplify like
+A simple logger built as class decorator, amplify like.
 
-## Important
+## Quick Start
 
-**Experimental decorators** are used for this package implementation and since experimental it has some bugs like unsafe typing.
+### Usage
+
+Due to the experimental decorators feature, there are some limitations.
+Starting from the preferred syntax `@Logger()`
+
+In TypeScript you need to simply enable `experimentalDecorators: true` in your `tsconfig.json`, to be able to use the preferred syntax.
+
+In JavaScript you need to use external libraries like [@babel/plugin-proposal-decorators](https://www.npmjs.com/package/@babel/plugin-proposal-decorators) to use the preferred syntax.
+
+Anyway since a decorator is just a function, you can use it by importing the `loggerDecorator` method.
+
+Arguments of logger are:
+
+- `name`: optional, default value is name of class
+- `options`:
+  - `level`: default to `info`
+
+```ts
+import Logger, {loggerDecorator} from 'simplelog-decorator'
+
+// @Logger('YourCustomClass')
+// @Logger('YourCustomClass', {level: 'warn'})
+// loggerDecorator()(YourClass) 
+@Logger() // name will be YourClass, level info
+class YourClass {
+   sample_method() {
+      this.logger.verbose('hi from sample_method')
+      this.logger.debug('hi from sample_method')
+      this.logger.info('hi from sample_method')
+      this.logger.warn('hi from sample_method')
+      this.logger.error('hi from sample_method')
+
+   }
+}
+
+
+```
+
+## Limitations
+
+As previously said, **experimental decorators** are used for this package implementation and since experimental it has some bugs like `unsafe typing`.
 TypeScript compiler complains when it finds out a property used inside a class that calls a decorator cause it cannot infer it, so as a temporary workaround simply declare an interface
 
 ```ts