chore(github): add issue template

ISSUE_TEMPLATE.md

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+### Before creating an issue, please try the following
+
+- Are you on the latest version of ytdl-core? If you're using a bot or application that depends on ytdl-core, check if it has an old version listed as a dependency.
+  - To check, run `npm ls ytdl-core`
+  - To install the latest version, run `npm install ytdl-core@latest`
+- Search the list of issues for a possible duplicate.
+  - If there is a duplicate issue thread, but it's closed, only post in it if it's been active in the past month. Otherwise, creating a new issue thread is fine.
+- If your question is about using the library for a specific use case, check out the [examples folder](https://github.com/fent/node-ytdl-core/tree/master/example).
+
+### Otherwise, feel free to open an issue
+
+Include the following if your issue is a bug
+
+- If you're getting a specific error message, include the full stack trace
+- If you're getting unexpected behavior without an error message
+  - What should happen?
+  - What happens instead?
+- Include any relevant code around ytdl-core. You don't have to upload your entire program, small snippets are fine.
+- If this error happens only on some videos, include a link or links to videos.