Add changeset (#349)

Author: eddeee888

.changeset/popular-schools-live.md

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+---
+'@eddeee888/gcg-typescript-resolver-files': minor
+---
+
+Add mappersRelativeTargetDir config option
+
+`string` (Default: `./`)
+
+By default, mappers must be siblings with the schema they represent. For example, if the schema file is `/path/to/schema.graphql`, the mapper file is `/path/to/schema.mappers.ts`. This extension allows mappers to reside in a different directory relative to the schema file using the pattern `<schemaPath>/<mappersRelativeTargetDir>/<schemaName><mappersFileExtension>`.