Add a status badge

Quick guide

[![TrustInSoft CI](https://ci.trust-in-soft.com/projects/<ACCOUNT_NAME>/<PROJECT_NAME>.svg?branch=master)](https://ci.trust-in-soft.com/projects/<ACCOUNT_NAME>/<PROJECT_NAME>)

More about the badge

A badge status is computed based on the statuses of the analyses that belong to the latest valid build. A build is valid if its result is complete, meaning that the build has not been canceled nor it is queued/running.

There are 3 possible statuses:

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