add hlaeja version catalog

- add gradle properties information in README.md
- remove repositories from build.gradle.kts
- change to settings.gradle.kts
  - add dependency resolution management
  - add plugin management repositories
- add catalog in gradle.properties

settings.gradle.kts

@@ -1 +1,37 @@
+import java.lang.System.getenv
+
+fun getProperty(property: String): String = extra[property] as String
+
+fun retrieveConfiguration(
+    property: String,
+    environment: String,
+): String? = if (extra.has(property)) getProperty(property) else getenv(environment)
+
+fun hlaejaRepository(repositoryHandler: RepositoryHandler) {
+    repositoryHandler.maven {
+        url = uri("https://maven.pkg.github.com/swordsteel/**")
+        name = "GitHubPackages"
+        credentials {
+            username = retrieveConfiguration("repository.user", "REPOSITORY_USER")
+            password = retrieveConfiguration("repository.token", "REPOSITORY_TOKEN")
+        }
+    }
+}
+
+dependencyResolutionManagement {
+    @Suppress("UnstableApiUsage")
+    repositories {
+        mavenLocal()
+        hlaejaRepository(this)
+        mavenCentral()
+    }
+    versionCatalogs.create("hlaeja").from("ltd.hlaeja.catalog:hlaeja-version-catalog:${getProperty("catalog")}")
+}
+
+pluginManagement.repositories {
+    mavenLocal()
+    hlaejaRepository(this)
+    gradlePluginPortal()
+}
+
 rootProject.name = "hlaeja-library"