Added ACCEPTANCE.md document

ACCEPTANCE.md

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+# Acceptance guide
+
+J2EO has two major acceptance criteria:
+- crash-less operation on large Java projects (even if translation results are not completely accurate, i.e. some semantic parts are missing)
+- Coverage of features requested by Polystat
+
+To assess the project maturity, we included bash scripts that download some popular open-source Java projects and runs J2EO on them:
+
+| Project | Script             |
+|---------|--------------------|
+| Hadoop  | `./test-hadoop.sh` |
+| Kafka   | `./test-kafka.sh`  |
+
+Keep in mind, as the development of J2EO progresses and 1.0 release is not out, performance problems may persist, and translation of large files may take longer than satisfactory.
+
+## Performing the assessment
+
+To run the scripts on your own machine, you may `cd` into the repository directory and run either of the scripts provided in the table above.
+
+The script will build J2EO from the current checked out source code, download repo if it is missing, and start J2EO with arguments targeting the downloaded project.
+
+All data is stored in the `j2eo-data directory`, including original source code and translation results.
+
+Unfortunately, currently there is no integration with Polystat, so second criterion may only be checked manually. We work on automatization of this part.