updated readme

README.md

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+# MRS Buildfarm
+
+This package defines the Github Workflows for build MRS debian packages.
+
+## MRS ROS packages
+
+MRS ROS packages are defined in [mrs.yaml](./mrs.yaml).
+
+## Third-party ROS packages
+
+Third-party ROS packages are defined in [thirdparty.yaml](./thirdparty.yaml).
+
+## Non-ROS packages
+
+Non-ROS (not build by bloom) packages are defined in [nonbloom.yaml](./nonbloom.yaml).
+
+## Workflows
+
+Github workflows are located in [.github/workflows](.github/workflows).
+
+## CI Script
+
+The workflows utilize common scripts from [ci_scripts](https://github.com/ctu-mrs/ci_scripts).