Improve developer guide

[natrem]

I tried building this project, as a dependency for common-domain-model, but not published to standard maven repositories.
1- Is there a place to download binaries for rosetta?

When building from maven (one step at a time), I encountered several issues, that may be worth checking.

2. The developer guide indicates using java 11, but the root pom enforces java 17

3. The module com.regnosys.rosetta, during the mwe2Launcher execution, downloads SNAPSHOT dependencies for eclipse emf and core. I did not manage to find the root cause, but the work-around is to add the following maven settings (corporate mirror):

<mirror>
      <id>proxy-ossrh-sonatype</id>
      <mirrorOf>ossrh-snapshots</mirrorOf>
      <url>https://my-nexus-proxy.com/repository/oss-sonatype-snapshots/</url>
    </mirror>

Is it normal to rely on SNAPSHOT dependencies?

4. In the same module, generation relies on antlr. In module com.regnosys.rosetta.ide nodeJs is required, and downloaded. Both downloads require maven configuration for proxy: ``mvn -D"http.proxyHost"=proxy.host.com -D"http.proxyPort"=the_port install"
   Although it's not entirely specific to rosetta, the proxy limitations are a bit behind standard usage, so I think it's worth mentioning.

5. I'm now at rosetta-tools module, with failing tests. I probably need to set a version for the tests to pass. More to come 😄 This setup should probably appear in the documentation too. Found my issue, related to execution platform (PR to come).

[SimonCockx]

Hey @natrem, thanks for all of the feedback! I will try to verify and address your comments in the coming days. Feel free to reach out if you require further help to setup this project (although you do seem to be getting there on your own :) ).

Out of curiosity, may I ask what is your interest in this project?

[natrem]

I'm interested in the project in order to check out the CDM, in context on my work at Societe Generale (for a colleague actually).