add "IDE settings" instructions to README

* add some extra instructions for intellij users

to make lombok work smoothly with IntelliJ and its checkstyle plugin

* use the right lombok source directory

Co-authored-by: Johannes Visintini <johannes.visintini@heigit.org>

* new IDE settings section:

* move lombok instructions there
* make lombok instructions more generic as they could apply for eclipse also
* mention code style settings

* Add other (to be) marked directories to README.md

Co-authored-by: Johannes Visintini <johannes.visintini@heigit.org>

Author: tyrasd

CONTRIBUTING.md

@@ -1,8 +1,8 @@
 # Code Style
 
-We're using the [Google Java Style Guide](https://google.github.io/styleguide/javaguide.html) for the source code. With the [exception](https://google.github.io/styleguide/javaguide.html#s5.3-camel-case) that the abbreviations `OSM`, `OSH` and `OSHDB` are allowed to be used in method and class names. For some popular IDEs and code linting tools you can find settings-files of the used code style in the OSHDB repository: [config/ide](https://github.com/GIScience/oshdb/tree/master/config/ide).
+We're using the [Google Java Style Guide](https://google.github.io/styleguide/javaguide.html) for the source code. With the [exception](https://google.github.io/styleguide/javaguide.html#s5.3-camel-case) that the abbreviations `OSM`, `OSH` and `OSHDB` are allowed to be used in method and class names. For some popular IDEs and code linting tools you can find configuration files of the used code style in the OSHDB repository: [config/ide](https://github.com/GIScience/oshdb/tree/master/config/ide).
 
 
 # Check Examples
 
-To ensure that the ohsome API runs with a defined set of examples, we collect several examples, in addition to the integrated [unit and API tests](/src/test/java/org/heigit/ohsome/ohsomeapi). These examples are used to test the ohsome API before releases or productive deployments. If you fix a bug or implement a new feature, please think of a few exemplary requests to be added into the [check-ohsome-api repository](https://gitlab.gistools.geog.uni-heidelberg.de/giscience/big-data/ohsome/helpers/check-ohsome-api/-/issues/new). They can be added as [issue](https://gitlab.gistools.geog.uni-heidelberg.de/giscience/big-data/ohsome/helpers/check-ohsome-api/-/issues/new) or directly as [merge request](https://gitlab.gistools.geog.uni-heidelberg.de/giscience/big-data/ohsome/helpers/check-ohsome-api/-/merge_requests/new). More information, see [check-ohsome-api README](https://gitlab.gistools.geog.uni-heidelberg.de/giscience/big-data/ohsome/helpers/check-ohsome-api/-/blob/master/README.md#add-example).
+To ensure that the ohsome API runs with a defined set of examples, we collect several examples, in addition to the integrated [unit and API tests](/src/test/java/org/heigit/ohsome/ohsomeapi). These examples are used to test the ohsome API before releases or productive deployments. If you fix a bug or implement a new feature, please think of a few exemplary requests to be added into the [check-ohsome-api repository](https://gitlab.gistools.geog.uni-heidelberg.de/giscience/big-data/ohsome/helpers/check-ohsome-api/-/issues/new). They can be added as [issue](https://gitlab.gistools.geog.uni-heidelberg.de/giscience/big-data/ohsome/helpers/check-ohsome-api/-/issues/new) or directly as [merge request](https://gitlab.gistools.geog.uni-heidelberg.de/giscience/big-data/ohsome/helpers/check-ohsome-api/-/merge_requests/new). More information, see [check-ohsome-api README](https://gitlab.gistools.geog.uni-heidelberg.de/giscience/big-data/ohsome/helpers/check-ohsome-api/-/blob/master/README.md#add-example).

README.md

@@ -33,9 +33,18 @@ These instructions will get you a copy of the project up and running on your loc
 
 * [Java 11](https://openjdk.java.net/projects/jdk/11/) or higher
 * [Apache Maven 3.5](https://maven.apache.org/download.cgi) or higher
-* [Lombok 1.18.16](https://projectlombok.org/download) or higher. Please check the [requirements](https://projectlombok.org/setup/overview) for your IDE 
 * data: [download](http://downloads.ohsome.org/) it directly, or work through a guide on [how to prepare a new OSHDB extract](https://github.com/GIScience/oshdb/blob/master/oshdb-tool/etl/README.md)
 
+### IDE Settings
+
+* [Code style](/CONTRIBUTING.md#code-style): For some popular IDEs and code linting tools you can find configuration files of the used code style in the OSHDB repository: [config/ide](https://github.com/GIScience/oshdb/tree/master/config/ide).
+* [Lombok](https://projectlombok.org/): Please check the [setup instructions](https://projectlombok.org/setup/overview) for your IDE.
+* In some cases you have to mark some directories manually by their type:
+   * `src/main/lombok` as a _source_ directory,
+   * `src/test/java` as a _test-source_ directory,
+   * `src/main/resources` as a _resources_ directory, and
+   * `target`, `target/generated-sources/delombok`, `docs/_build`, and `ignite` as _unmarked_/_excluded_ directories.
+
 ### Setting-up/Running
 
 1. checkout/download the repository