README: Add usage

README.md

@@ -8,3 +8,53 @@ Status
 
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/net.rakugakibox.springbootext/spring-boot-ext-logback-access/badge.svg)](https://maven-badges.herokuapp.com/maven-central/net.rakugakibox.springbootext/spring-boot-ext-logback-access)
 [![Circle CI](https://circleci.com/gh/akihyro/spring-boot-ext-logback-access.svg?style=shield)](https://circleci.com/gh/akihyro/spring-boot-ext-logback-access)
+
+Supported servlet containers
+----------------------------
+
+* Embedded Tomcat
+* Embedded Jetty
+
+Usage
+-----
+
+### Maven dependency:
+
+```xml
+<dependency>
+    <groupId>net.rakugakibox.springbootext</groupId>
+    <artifactId>spring-boot-ext-logback-access</artifactId>
+    <version>1.0</version>
+</dependency>
+```
+
+### Configuration properties (application.yml):
+
+```yml
+logback.access:
+  config: "classpath:your-logback-access.xml"
+    # Auto-detected by default.
+    #   => "classpath:logback-access-test.xml"
+    #   => "classpath:logback-access.xml"
+    #   => "classpath:net/rakugakibox/springbootext/logback/access/logback-access.xml"
+```
+
+### Logback-access configuration example (logback-access.xml)
+
+```xml
+<configuration>
+    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>common</pattern>
+        </encoder>
+    </appender>
+    <appender-ref ref="CONSOLE" />
+</configuration>
+```
+
+See Also: [HTTP-access logs with logback-access, Jetty and Tomcat - Logback-access](http://logback.qos.ch/access.html)
+
+License
+-------
+
+Licensed under the [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0).