Add DEVELOPER.md for developer notes (#25)

Author: danmar

DEVELOPER.md

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+
+# Developer notes
+
+## Development
+
+### installing tools needed
+
+### build
+
+command
+
+### run tests locally
+
+command
+
+### testing plugin in eclipse
+
+
+## release process
+
+### git tag and github release
+
+create a tag in the repo
+create a release in github
+
+### updating files
+
+download artifact "cppcheclipse-repository" from the github action "Java CI"
+unzip the artifact and upload files to https://files.cppchecksolutions.com/cppcheclipse/ folder
+
+### publish plugin in marketplace
+
+to make sure that proper version info etc is shown in marketplace..
+