.github: rename ISSUE_TEMPLATE to ISSUE_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

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+Hi, there!
+
+Thank you for using SoftEther.
+
+Before you submit an issue, please read the following:
+
+Is this a question?
+
+- If the answer is "yes", then please ask your question on [www.vpnusers.com](http://www.vpnusers.com).
+The issue section on GitHub is reserved for bugs and feature requests.
+
+- If the answer is "no", please read the following:
+
+We provide a template which is specifically made for bug reports, in order to be sure that the report includes enough details to be helpful.
+
+Please use or adapt it as needed.
+
+---
+
+### Prerequisites
+
+* [ ] Can you reproduce?
+* [ ] Are you running the latest version of SoftEtherVPN?
+
+**SoftEther version:**
+**Component:** [Server, Client, Bridge, etc.]
+**Operating system:** [Windows, Linux, BSD, macOS, etc.]
+**Architecture:** [64 bit, 32 bit]
+
+[In case it's a computer with known specs, such as the Raspberry Pi, you can specify it omitting the details.]
+**Processor:** [Specify brand and model. Example: AMD Ryzen 7 1800x]
+
+### Description
+
+[Description of the bug]
+
+**Expected behavior:**
+[What you expected to happen]
+
+**Actual behavior:**
+[What actually happened]
+
+### Steps to reproduce
+
+1. [First step]
+2. [Second step]
+3. [And so on...]