Create documentation

docs/migrations/migrations-gradle.md

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+# Execute Migrations with Gradle
+
+You can execute migration with a Gradle task like this:
+
+```kotlin
+// build.gradle.kts
+import fr.postgresjson.connexion.Connection
+import fr.postgresjson.connexion.Requester
+import fr.postgresjson.migration.Migrations
+
+buildscript {
+    dependencies {
+        classpath("com.github.flecomte:postgres-json:+")
+    }
+}
+
+val migration by tasks.registering {
+    doLast {
+        val connection = Connection(
+            host = "localhost",
+            port = 5432,
+            database = "database",
+            username = "username",
+            password = "password"
+        )
+        Migrations(
+            connection,
+            file("$buildDir/resources/main/sql/migrations").toURI(),
+            file("$buildDir/resources/main/sql/functions").toURI()
+        ).run()
+    }
+}
+```
+
+```shell
+$ gradle migration
+```