Added an example to README

README.md

@@ -57,6 +57,8 @@ and these non-functional requirements:
 
 ## Examples
 
+The examples don't include all the possible ways how to use the library but will give an overview. When you see a method that is useful but doesn't necessarily solve your use case then just head over to [ZipUtil.class](https://github.com/zeroturnaround/zt-zip/blob/master/src/main/java/org/zeroturnaround/zip/ZipUtil.java) file and see the sibling methods that are named the same but arguments might be different.
+
 ### Unpacking
 
 #### Check if an entry exists in a ZIP archive
@@ -165,6 +167,10 @@ ZipUtil.pack(new File("/tmp/demo"), new File("/tmp/demo.zip"), new NameMapper()
   }
 });
 ```
+#### Compress a file into a ZIP archive
+```java
+ZipUtil.packEntry(new File("/tmp/demo.txt"), new File("/tmp/demo.zip"));
+```
 
 #### Add an entry from file to a ZIP archive
 ```java