include readme file with installation instructions

readme.md

+Setup instruction:
+
+1. Clone repository
+2. Build with maven via `mvn package`
+3. Final jar is generated in `/web/target`
+4. In order to run you can start the jar via `java -jar xxx.jar` or run `main()` method in `Runner` class in `web` module.
+5. The application requires some credentials to work properly, and those are collected from environmental variables:
+- `login` - service account login
+- `pass` - password for CERN DB1 for specified login
+- `pass2` - password for Infor, Impact and LanDB for specified login
+- `icesasLogin` - login for IceSAS database 
+- `icesasPassword` - password for IceSAS database
+ 
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