Add basic bootstrapping instructions

Author: headius

java-wasm/README.md

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+This dir contains the chicory-prism artifact, a version of prism compiled to WASM and then AOT compiled to JVM bytecode by the Chicory project.
+
+Generate the templated sources:
+
+```
+PRISM_EXCLUDE_PRETTYPRINT=1 PRISM_SERIALIZE_ONLY_SEMANTICS_FIELDS=1 PRISM_JAVA_BACKEND=jruby bundle exec rake templates
+```
+
+Compile to WASM using WASI SDK version 25:
+
+```
+make java-wasm WASI_SDK_PATH=.../wasi-sdk-25.0-arm64-macos
+```
+
+Build the AOT-compiled machine and wrapper library:
+
+```
+mvn -f java-wasm/pom.xml clean package
+```
+
+This should build the chicory-wasm jar file and pass some basic tests.
+
+The jar will be under `java-wasm/target/chicory-prism-#####-SNAPSHOT.jar` or can be installed by using `install` instead of `pacakge` in the `mvn` command line above.