add project’s build status badge

Author: Helene

README.md

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+[![CircleCI](https://circleci.com/gh/IBM/ibm-spectrum-scale-bridge-for-grafana.svg?style=svg)](https://app.circleci.com/pipelines/github/IBM/ibm-spectrum-scale-bridge-for-grafana?branch=master)
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 The ***IBM Spectrum Scale bridge for Grafana*** could be used for exploring IBM Spectrum Scale performance data on [Grafana dashboards](https://grafana.com/grafana/).
 
 Grafana Bridge is a standalone Python application. It translates the IBM Spectrum Scale metadata and performance data collected by the [IBM Spectrum Scale performance monitoring tool (ZiMon)](https://www.ibm.com/support/knowledgecenter/en/STXKQY_4.2.3/com.ibm.spectrum.scale.v4r23.doc/bl1adv_PMToverview.htm) to the query requests acceptable by the [Grafana integrated openTSDB plugin](https://grafana.com/docs/features/datasources/opentsdb/).