A few things that you may want to consider to help you move forward with this:
1. Define your target market in more detail:
a. Nigerian Pidgin speakers vs. English speakers vs. both - and why
b. What platform would this be used on? (e.g. If smartphones: Define the percentage of people in Nigeria that use smartphones (e.g. 13%, 25 million).)
c. If non-English speaking Nigerian Pidgin speakers: Define the percentage of smartphone users within this group.
d. Why will these speakers use this product and how will they benefit from it?

2. What dialect is it based on and how many errors will come up with other dialects? Since there are multiple Nigerian Pidgin dialects and often ethnic groups add additional words, it may help to map out the differences to get a complete picture to help you decide on the best location and way to implement.

3. What are the potential revenue streams with this product? (e.g. product purchase for personal use vs. company use, ads, etc.)