Update issue templates

Author: bramp

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+```java
+// Example code
+```
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Version (if applicable):**
+ - OS: [e.g. Linux]
+ - Java Version [e.g. 8]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Have a question on how to use ffmpeg-cli-wrapper
+
+---
+
+The ffmpeg-cli-wrapper library is a simple wrapper around the ffmpeg command line. If you have questions on how to use the library, please check out the [usage](https://github.com/bramp/ffmpeg-cli-wrapper#usage), or [random examples](https://github.com/bramp/ffmpeg-cli-wrapper/wiki/Random-Examples). If that doesn't solve your problem please fill out the following:
+
+**The question**
+A clear and concise description of what you are trying to acheive.
+
+**Example ffmpeg command**
+```shell
+ffmpeg -i input.mp4 output.mp4
+```
+
+**What you have tried**
+What you have tried so far, with example code, or error messages.