Update README.md

Adding the gzip command with *.fastq

README.md

@@ -60,6 +60,11 @@ In your terminal use this command
 gzip SRR5625858.fastq
 ```
 
+To compress all the fastq files simultaneously, you can use the following command in the terminal (in the DATA folder):
+```shell
+gzip *.fastq
+```
+
 At this point you have all the data needed to run the pipeline.
 **Run dada**