Added issue template.

ISSUE_TEMPLATE.md

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+# Issue Report
+
+If you are reporting a bug, please fill the sections below (if they are applicable), otherwise feel free to delete those that don't apply. Thank you! 🙏🏼
+
+### Description
+
+What are you reporting? 
+
+### Expected behaviour
+
+Tell us what you think should happen.
+
+### Actual behaviour 
+
+Tell us what actually happens.
+
+### Steps to reproduce the problem
+
+Tell us what we should do to reproduce the issue.
+
+### Language / Framework Versions
+
+1. **Language used:**
+2. **Framework used:**
+
+### Testing environment
+
+1. **Operating system:**
+2. **Browser version:**
+
+### Screenshots
+
+Feel free to insert here any screenshots that you consider helpful in solving your issue.
+
+
+**Filling this, you're helping yourself and repo maintainers in solving your issues quicker! Teamwork makes the dreamwork 🤜🏼🤛🏻**