How to add a custom keyboard layout to IBus / m17n on Linux Mint 18

I’m new to Linux. I use Linux Mint 18.3.
Using various suggestions and advice found on fora related to the topic, I designed my own custom layout for IBus / m17n on Linux Mint 18, which is a *.mim file. The keyboard is designed for Sanskrit and other Asian languages, and the file begins with "sa-", as all standard files which Sanskrit, but the file and keyboard have their unique names (starting with "sa-" though).
My question now is how can I add this keyboard to the system / IBus.
I copied to file to the directory /usr/share/m17n. But the keyboard and the language is invisible to IBus.
How should I proceed? What else should I do so that I can see the keyboard in lanuguage IBUS PREFERENCES engine?
I have spent a couple of days reading different fora on the subject, but can’t find an answer.
Any help?
I would greatly appreciate a step-by-step advice.
Thank you