Create documentation

docs/migrations/migrations-application.md

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+# Execute migration in application
+```kotlin
+import fr.postgresjson.migration.Migrations
+import fr.postgresjson.connexion.Connection
+
+val conn: Connection = TODO()
+val migrations = Migrations(
+    conn,
+    this::class.java.getResource("/sql/migrations")?.toURI() ?: error("No migrations found"),
+    this::class.java.getResource("/sql/functions")?.toURI() ?: error("No sql function found")
+)
+
+migrations.status() // Show executed and not executed migrations
+migrations.runDry() // Execute migration in transaction and rollback at the end
+migrations.run() // Execute migration in transaction and commit if no error
+```