README: improvements

Author: glarrain

README.md

@@ -1,2 +1,22 @@
-# gcp-utils-python
-Fyndata's Python library of Google Cloud Platform (GCP) utils
+# fyndata/gcp-utils-python
+
+Fyndata's Python library of Google Cloud Platform (GCP) utils.
+
+- Python package: `fd_gcp`
+- Python distribution package name: `fyndata-gcp-utils`
+- PyPI package name: `fyndata-gcp-utils`
+
+
+## Build status
+
+| branch  | build |
+| ------- | ----- |
+| master  | [![CircleCI](https://circleci.com/gh/fyndata/gcp-utils-python/tree/master.svg?style=shield)](https://circleci.com/gh/fyndata/gcp-utils-python/tree/master) |
+| develop | [![CircleCI](https://circleci.com/gh/fyndata/gcp-utils-python/tree/develop.svg?style=shield)](https://circleci.com/gh/fyndata/gcp-utils-python/tree/develop) |
+
+
+## Supported Python versions
+
+Only Python 3.7. Python 3.6 and below will not work because we use some features introduced in
+Python 3.7. In the future, for real multiversion support we need to set up `tox`
+(see [tox.ini](tox.ini) and [setup.py](setup.py)).