Let the gap between your completion of degree and start of employment, be as it is. Please don't try to cover up with fake experience certificate. Fake certificates never serve any fruitful purpose. Also in future when you apply for reputed Companies if they go for BGV process you will be under trouble. So please refrain from doing so and always be genuine about your career history.
13th August 2019 From India, Madras
Any way, from your question I hereby infer that you do not have much experience and see life in a lighter way and more interested to achieve things in a "short-cut" way. Please desist from such practice.
Rise in career is similar to carrying a heavy load/weight and climbing up step-by-step in a ladder. It will take its own course of time. But whatever you do, do it in a sincere, (with application of your mind, sometimes heart too), way. Finally you will succeed.
HR Managers, in general will not appreciate such "added" certificates, but shall definitely appreciate a true declaration.
14th August 2019 From India, Aizawl
14th August 2019 From India, Mumbai