Set up project structure

README.md

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+# Hlæja Version Catalog.
+
+A Version Catalog in Gradle is a centralized way to manage and reference dependency versions across multiple projects, reducing duplication and ensuring consistency in dependency management. It simplifies the process of updating dependencies by maintaining a single source of truth for versions.
+
+## Releasing version catalog.
+
+Run `release.sh` script from `master` branch.
+
+## Publishing version catalog.
+
+### Publish version catalog locally.
+
+```shell
+./gradlew clean publishToMavenLocal
+```
+
+### Publish version catalog to repository.
+
+```shell
+./gradlew clean publish
+```
+
+### Global gradle properties.
+
+To authenticate with Gradle to access repositories that require authentication, you can set your user and token in the `gradle.properties` file. 
+
+Here's how you can do it:
+
+1. Open or create the `gradle.properties` file in your Gradle user home directory:
+    - On Unix-like systems (Linux, macOS), this directory is typically `~/.gradle/`.
+    - On Windows, this directory is typically `C:\Users\<YourUsername>\.gradle\`.
+2. Add the following lines to the `gradle.properties` file:
+    ```properties
+    repository.user=your_user
+    repository.token=your_token_value
+    ```
+    or use environment variables `REPOSITORY_USER` and `REPOSITORY_TOKEN`