Add cheat for gzip

cheat/cheatsheets/gzip

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+# To create a *.gz compressed file
+gzip test.txt
+
+# To create a *.gz compressed file to a specific location using -c option (standard out)
+gzip -c test.txt > test_custom.txt.gz
+
+# To uncompress a *.gz file
+gzip -d test.txt.gz
+
+# Discplay compression ratio of the compressed file using gzip -l
+gzip -l *.gz
+
+# Recursively compress all the files under a specified directory
+gzip -r documents_directory