Add new-issue-template and update README.md

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/new-issue-template.md

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+---
+name: new issue template
+about: generic template for new issues
+title: "[module] Short description of the issue/bug/feature"
+labels: ''
+assignees: ''
+---
+
+Before submitting a new issue, please verify and check:
+
+ - [ ] The issue is specific to Raylib-cs and not raylib
+ - [ ] I checked there is no similar issue already reported
+ - [ ] My code has no errors or misuse of Raylib-cs
+
+### Issue description
+
+*Briefly describe the issue you are experiencing (or the feature you want to see added to Raylib-cs). Tell us what you were trying to do and what happened instead. You can also ask questions on the [raylib discord server](https://discord.gg/raylib).*
+
+### Environment
+
+*Provide your Platform, Operating System, OpenGL version, GPU details where you experienced the issue.*
+
+### Issue screenshot
+
+*If possible, provide a screenshot that illustrates the issue. Usually an image is better than a thousand words.*
+
+### Code example
+
+*Provide minimal reproduction code to test the issue. Please, format the code properly and try to keep it as simple as possible, just focusing on the experienced issue.*