Create ISSUE_TEMPLATE.md

Closes #132

.github/ISSUE_TEMPLATE.md

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+## Please follow the guide below
+
+- You will be asked some questions and requested to provide some information, please read them **carefully** and answer honestly
+- Put an `x` into all the boxes [ ] relevant to your *issue* (like that [x])
+- Use *Preview* tab to see how your issue will actually look like
+
+---
+
+### WARNING
+All the invalid issues will be rejected!!
+
+---
+
+### Before going further
+* If your problem is a bug with the **youtube-dl** program or a request for new site support please report it [here](https://github.com/rg3/youtube-dl/issues)
+
+* Make sure you are using the *latest* **youtube-dl-gui** version: `Options > About` tab. If it's not please download & install the latest version for your OS and check if your issue still persists
+
+* Make sure you are using the *latest* **youtube-dl** version: Click the `Update` button on the main screen and check if your issue still persists
+
+* Make sure you searched the bugtracker for similar issues including closed ones
+
+  - [ ] **I assure** that my problem is **NOT** with **youtube-dl**
+  - [ ] I've **verified** and **I assure** that I'm running youtube-dl-gui **0.3.8**
+  - [ ] **I assure** that i am using the latest version of **youtube-dl**
+  - [ ] [Searched](https://github.com/MrS0m30n3/youtube-dl-gui/issues) bugtracker
+
+---
+
+### What is the purpose of your *issue*?
+- [ ] Bug during the download process (encountered problems after hitting the *Download* button)
+- [ ] Bug other (encountered other problems with *youtube-dl-gui*)
+- [ ] Feature request (request for a new functionality)
+- [ ] Question
+- [ ] Other
+
+---
+
+Please remove the following section between the (---) if your problem does not belong to the **bug during the download process** category
+
+#### Provide the full verbose output as follows:
+
+1. Add `-v` flag to Options > Commands tab
+2. Re-try to download the URL
+3. Go to `Options > Log` tab and click the `View Log` button
+4. Copy the **whole** content of the log file and insert it between the triple ``` part
+
+```
+[delete me and insert your log content here]
+```
+
+---
+
+Please remove the following section between the (---) if your problem does not belong to **the first two categories (bug report)**
+
+#### What operating system do you use ?
+
+#### List of actions to perform to reproduce the problem:
+  1. ..
+  2. ..
+  3. ..
+  
+#### What is the expected behaviour ?
+
+#### What happens instead ?
+
+---
+
+### Description of your *issue*, suggested solution and other information. Please make sure the description is worded well enough to be understood.
+