couchdb: add page (#1553)

pages/common/couchdb.md

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+# couchdb
+
+> Command line interface for Apache CouchDB database server.
+
+- Start couchdb:
+
+`couchdb`
+
+- Start couchdb interactive shell:
+
+`couchdb -i`
+
+- Start couchdb as a background process:
+
+`couchdb -b`
+
+- Kill the background process (Note: It will respawn if needed):
+
+`couchdb -k`
+
+- Shutdown the background process:
+
+`couchdb -d`