docs: add content

Author: xchopin

docs/en/developer/coding_standards.md

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+# Coding Standards
+
+OpenLRW follows the [Google Java Style Guide](https://google.github.io/styleguide/javaguide.html) for having a better open source experience.
+

docs/en/developer/index.md

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+# Developer Guide
+Contributing to the open source project.
+
+* Contributor Guidelines
+* Coding Standards
+* Using Maven for development purposes
+* [Automated Tests](tests.md)
+* Run OpenLRW through Docker
+* Access to Swagger
+* Helpers

docs/en/developer/tests.md

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+# Automated Tests
+
+[Spring JUnit](https://docs.spring.io/spring-boot/docs/current/reference/html/boot-features-testing.html) is used to run automated tests on OpenLRW when building the executable.
+
+All the tests are located in the `src/test` directory.
+
+## Running the tests
+
+Execute the following command to execute Unit and Integration tests : `mvn test`
+
+
+## Continuous Integration with Travis-CI
+After each commit pushed on the main repository, unit tests are executed on an Oracle JDK 8 Virtual Machine.
+
+The Travis config file `.travis.yml` is located on the root directory of OpenLRW.