DOC: Mention PyPi package in INSTALL.md

INSTALL.md

-
 # Installation ##
 
 
@@ -41,16 +40,18 @@ installation](#generic-installation).
 
 ## Generic installation ####
 
----
+The CaosDB crawler is available as [PyPi
+package](https://pypi.org/project/caoscrawler/) and can simply installed by
+
+```sh
+pip3 install caoscrawler
+```
 
-Obtain the sources from GitLab and install from there (`git` must be installed for
-this option):
+Alternatively, obtain the sources from GitLab and install from there (`git` must
+be installed for this option):
 
 ```sh
 git clone https://gitlab.com/caosdb/caosdb-crawler
 cd caosdb-crawler
 pip3 install --user .
 ```
-
-**Note**: In the near future, this package will also be made available on PyPi.
-