Add documentation, for #313

Author: serra

docs/more-info/build-server-setup/jenkins.md

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+# Jenkins Setup
+
+Injecting environment variables is not supported in Jenkins natively, but Jenkins plugins exist that provide this functionality. Of these plugins [EnvInject] appears to be the most popular with over 20k downloads per month.
+
+To inject the GitVersion variables as environment variables for a build job using  [EnvInject], do the following:
+
+ 1. Add an **Execute Windows batch command** build step with *Command*:
+    `gitversion /output buildserver`
+ 1. Add an **Inject environment variables** build step and use value 'gitversion.properties' for the *Properties File Path* parameter 
+
+This assumes GitVersion.exe is available on the command line.
+
+You can verify correct injection of environment variables by adding another "Execute Windows batch command" build step with the following *Command*:
+
+```
+@echo Retrieving some GitVersion environment variables:
+@echo %GitVersion_SemVer%
+@echo %GitVersion_BranchName%
+@echo %GitVersion_AssemblySemVer%
+@echo %GitVersion_MajorMinorPatch%
+@echo %GitVersion_Sha%
+```
+
+  [EnvInject]: https://wiki.jenkins-ci.org/display/JENKINS/EnvInject+Plugin