README: add instructions for ./mvnw JAR generation

GoogleCloudDataproc · Aug 3, 2023 · 02fc710 · 02fc710
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commit 02fc710
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diff --git a/README.md b/README.md
@@ -4,3 +4,9 @@
 Please run the [Cloud Spanner Emulator](https://cloud.google.com/spanner/docs/emulator) locally.
 
 Before running `mvn`, please set the variable `SPANNER_EMULATOR_HOST=localhost:9090`
+
+## Compiling the JAR
+To compile it against Spark 3.1, Please run
+```shell
+./mvnw install -P3.1
+```