issue template

.github/ISSUE_TEMPLATE.md

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+**Please read this first**
+
+Bugs in Cvxportfolio are defined as deviations between the behavior
+of the code and its description in 
+[the documentation](https://www.cvxportfolio.com) or in the 
+[the accompanying paper](https://web.stanford.edu/~boyd/papers/pdf/cvx_portfolio.pdf).
+
+Features requests are well-received but will probably be answered with a
+suggestion that you develop them and contribute.
+
+Issues for any other reason can as well be created.
+
+## Specifications
+- Problem: Bug, feature request, or other?
+- OS:
+- Cvxportfolio version:
+- Python version:
+- Cvxpy version:
+- Pandas version:
+- Data: Downloaded by Cvxportfolio or user-provided?
+
+
+## Description
+A clear and concise description of the problem.
+
+## How to reproduce
+Ideally a minimal snippet of code that reproduces the problem if possible.
+
+## Additional information
+Extra context.
+
+## Output
+Entire Cvxportfolio output including the entire stack trace (if applicable).