Update contributing.md

docs/contributing.md

@@ -21,6 +21,12 @@ Before you get started, we ask that you:
 * Sign the [lakeFS CLA](https://cla-assistant.io/treeverse/lakeFS) when making your first pull request (individual / corporate)
 * Submit any security issues directly to [security@treeverse.io](mailto:security@treeverse.io)
 
+## Get ready for Hacktoberfest!
+
+Contribute to open-source projects throughout October 2020 by stepping up to Digital Ocean's annual tradition of hosting [Hacktoberfest](https://hacktoberfest.digitalocean.com/).  We _always_ welcome pull requests to lakeFS - but throughout October your pull requests to open source projects can get you some cool swag (stickers & t-shirt).  Check out our [contributing guide](https://docs.lakefs.io/contributing) and join our [slack channel](https://join.slack.com/t/lakefs/shared_invite/zt-g86mkroy-186GzaxR4xOar1i1Us0bzw) for help, more ideas, and discussions. 
+
+Not sure what to do?  We marked some issues that could get you started quickly on our [Hacktoberfest list](https://github.com/treeverse/lakeFS/issues?q=is%3Aissue+is%3Aopen+label%3Ahacktoberfest).
+
 ## Getting Started
 
 Want to report a bug or request a feature? Please [open an issue](https://github.com/treeverse/lakeFS/issues/new)