Update README.md

README.md

-# repository
+# maven-repo
+naiterui maven repository.
 
+## Usage
+pom.xml:
+```xml
+    <repositories>
+        <repository>
+            <id>naiterui-mvn-repo</id>
+            <url>http://git.naiterui.com/maven-repo/repository/raw/master/</url>
+        </repository>
+    </repositories>
+```
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