Issue and PR templates

[Dynnammo]

Context

As a new user interested to create issues or wanting to add a new alternative to this repository, I must rely on the README provided, which is great, but I may rush and forget conditions for the solution to be added.

Solution

• Add an issue template in order to enforce users to respect a
• Add an PR template for people wanting to propose a new alternative with ticking boxes with criterias asked in the README :

Funding

I can handle this (short) issue is this is validated

Its product is strongly based on an open-source repo
It has a well-known closed-source competitor, solving a similar business problem
It is a private for-profit company, founded in the last 10 years
Its repo has 100+ stars on GitHub