Merge pull request #6 from sandrask/issue-5

docs: Update readme

README.md

@@ -1 +1,35 @@
+[![Release](https://img.shields.io/github/release/trustbloc/edge-core.svg?style=flat-square)](https://github.com/trustbloc/edge-core/releases/latest)
+[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://raw.githubusercontent.com/trustbloc/edge-core/master/LICENSE)
+[![Godocs](https://img.shields.io/badge/godoc-reference-blue.svg)](https://godoc.org/github.com/trustbloc/edge-core)
+
+[![Build Status](https://dev.azure.com/trustbloc/edge/_apis/build/status/trustbloc.edge-core?branchName=master)](https://dev.azure.com/trustbloc/edge/_build/latest?definitionId=36&branchName=master)
+[![codecov](https://codecov.io/gh/trustbloc/edge-core/branch/master/graph/badge.svg)](https://codecov.io/gh/trustbloc/edge-core)
+[![Go Report Card](https://goreportcard.com/badge/github.com/trustbloc/edge-core)](https://goreportcard.com/report/github.com/trustbloc/edge-core)
+
 # edge-core
+
+Edge Core implements core components that are shared between various edge services. 
+
+## Prerequisites (General)
+- Go 1.13
+
+## Targets
+```
+# run checks and unit tests
+make all
+
+# run linter checks
+make lint
+
+# run license checks
+make license
+
+# run unit tests
+make unit-test
+```
+
+## Contributing
+Thank you for your interest in contributing. Please see our [community contribution guidelines](https://github.com/trustbloc/community/blob/master/CONTRIBUTING.md) for more information.
+
+## License
+Apache License, Version 2.0 (Apache-2.0). See the [LICENSE](LICENSE) file.