Update README.md

README.md

@@ -1,4 +1,65 @@
 # How to use
 
-Here is tutorial
+![JVM](https://img.shields.io/badge/JVM-red?style=for-the-badge&logo=openjdk&logoColor=white)
+![Android](https://img.shields.io/badge/Android-green?style=for-the-badge&logo=android&logoColor=white)
+![Js](https://img.shields.io/badge/JavaScript-323330?style=for-the-badge&logo=javascript&logoColor=F7DF1E)
+
+It is simple logging tool which is using built-in tools for logging:
+
+* `java.util.logging.Logger` for `JVM`
+* `android.util.Log` for `Android`
+* `Console` for `JS`
+
+## How to use
+
+### Fast-travel
+
+Just use some boring extensions like:
+
+```kotlin
+KSLog.i("Some message")
+// OR
+KSLog.i("Some tag", "Some message")
+// OR
+KSLog.i("Some tag", "Some message", IllegalArgumentException("So, that is exception :)"))
+// OR EVEN
+KSLog.l(LogLevel.INFO, "Some tag", "Some message", IllegalArgumentException("So, that is exception :)"))
+```
+
+### A little bit deeper
+
+There are several important things in context of this library:
+
+* Default logger (available via `KSLog`)
+* Local logger (can be created via `KSLog` functions and passed anywhere as `KSLog`)
+* Logging shortcuts like `KSLog.i`/`KSLog.info`
+
+Default logger can be created by passing `defaultTag` and one of variants log level filters: set or minimal loggable level. In `JVM` you also may setup any logger as base logger for default realizations of `KSLog`. Besides, you may use your own callback (on **any target platform**) as output of logging:
+
+```kotlin
+val logger = KSLog { logLevel, optionalTag, message, optionalThrowable ->
+    println("[$logLevel] $optionalTag - $message: $optionalThrowable.stackTraceToString()")
+}
+```
+
+In the example above we will take the `logger` which will just print incoming data as common output.
+
+## Installation
+
+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/dev.inmo/kslog/badge.svg)](https://maven-badges.herokuapp.com/maven-central/dev.inmo/kslog)
+
+### Gradle
+
+```groovy
+implementation "dev.inmo:kslog:$kslog_version"
+```
+
+### Maven
+
+```xml
+<dependency>
+  <groupId>dev.inmo</groupId>
+  <artifactId>kslog</artifactId>
+  <version>${kslog_version}</version>
+</dependency>
 ```