Create PULL_REQUEST_TEMPLATE.md
Create PULL_REQUEST_TEMPLATE.md

Added PR template - mirrors Che's
codenvy/codenvy,R-Brain/codenvy,codenvy/codenvy,R-Brain/codenvy,codenvy/codenvy,R-Brain/codenvy,R-Brain/codenvy,codenvy/codenvy,codenvy/codenvy,R-Brain/codenvy,codenvy/codenvy,R-Brain/codenvy