Add structure and README files.

README.md

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-# openeo-community-example
+# openEO Community Examples
+
 A community-driven effort to make examples, user-defined processes and code snippets available in a single place.
+
+* [User-defined Processes](processes/)
+* [JavaScript Client examples and code snippets](javascript/)
+* [Python Client examples and code snippets](python/)
+* [R Client examples and code snippets](r/)
+* [Other resources](other/)
+
+## Contributing
+
+* We are looking forward for contributions from anyone!
+* Each contribution must be submitted as a PR to the most suitable folder (see above).
+* Please add each contribution to the overview tables in the corresponding README.md file.
+* PRs may need to fulfill a set of requirements that are documented in each folder separately and may be checked by a CI tool.
+* All contributions here will be licensed under the terms of the [Apache-2.0 license](LICENSE).

javascript/README.md

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+# JavaScript Client - Examples and Code Snippets
+
+This folder contains examples and code snippets for the openEO JavaScript client (including NodeJS and TypeScript).
+
+## Overview
+
+Environments: `JS`, `TS` or `Node`
+
+| Title | Environment | Description |
+| ----- | ----------- | ----------- |
+| ...   | `JS`        | ...         |
+
+## Contributing
+
+* Please provide each contribution in a separate folder.

other/README.md

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+# Other useful resources
+
+This folder contains all useful resources that don't fit into any of the other categories.
+
+## Overview
+
+| Title | Description |
+| ----- | ----------- |
+| ...   | ...         |
+
+## Contributing
+
+* Please provide each contribution in a separate folder, if required. You may also just link to external web pages.

processes/README.md

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+# User-defined Processes
+
+This folder contains user-defined processes that can be run by any openEO client (e.g. Web Editor, Python or R).
+
+## Overview
+
+| ID | Categories | Summary |
+| -- | ---------- | ------- |
+| ... | ...       | ...     |
+
+## Contributing
+
+* Please provide one JSON file per user-defined process directly into this folder (no sub-folders).
+* All processes must be parametrized (e.g. no hard-coded collection names).
+* All processes must have appropriate metadata included and follow common best practices. These are enforces by a CI tool that checks the processes for compliance.
+  Run `npm test` to check your contributon for compliance.

python/README.md

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+# Python Client - Examples and Code Snippets
+
+This folder contains examples and code snippets for the openEO Python client.
+
+## Overview
+
+Environments: `Python` (plain Python code), `Jupyter` (e.g. Notebooks)
+
+| Title | Environment | Description |
+| ----- | ----------- | ----------- |
+| ...   | `Python`    | ...         |
+
+## Contributing
+
+* Please provide each contribution in a separate folder.

r/README.md

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+# R Client - Examples and Code Snippets
+
+This folder contains examples and code snippets for the openEO R client.
+
+## Overview
+
+Environments: `R` (plain R code), `RMarkdown` (incl. knitr), `Jupyter` (e.g. Notebooks)
+
+| Title | Environment | Description |
+| ----- | ----------- | ----------- |
+| ...   | `R`         | ...         |
+
+## Contributing
+
+* Please provide each contribution in a separate folder.