Preparations for making repo public (#1)

* initial readme

* add security.md

* add code of conduct

* add link to code of conduct

* change CC-BY license to 4.0

README.md

@@ -1,2 +1,21 @@
-# cell-census
-CELLxGENE Cell Census
+# CELLxGENE Cell Census
+
+This repository contains documentation and example code related to the Chan Zuckerberg CELLxGENE Cell Census.
+
+The CZ Cell Census is an aggregation of all public single cell data available in [CELLxGENE Discover](https://cellxgene.cziscience.com/), published in API-accessible formats, including the [SOMA API](https://github.com/single-cell-data/).
+
+### Reuse
+
+The contents of this Github repository are freely available for reuse under the [MIT license](https://opensource.org/licenses/MIT). Data in the CZ Cell Census are available for re-use under the [CC-BY license](https://creativecommons.org/licenses/by/4.0/).
+
+### For More Help
+
+Please file a issue on this repo, or contact us at <[email protected]>
+
+### Security
+
+If you believe you have found a security issue, we would appreciate notification. Please send email to <[email protected]>.
+
+### Code of Conduct
+
+This project adheres to the Contributor Covenant [code of conduct](https://github.com/chanzuckerberg/.github/blob/master/CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code. Please report unacceptable behavior to <[email protected]>.

SECURITY.md

@@ -0,0 +1 @@
+If you believe you have found a security issue, we would appreciate notification. Please send email to <[email protected]>.