Documentation update.

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,49 @@
+### Prerequisites
+
+* [ ] Are you running the latest version?
+* [ ] Can you reproduce the problem in the debug version?
+
+### Check and fill as appropiate:
+* [ ] I was running DiscImageChef under Windows [version here]...
+* [ ] I was running DiscImageChef under Linux [version here]...
+* [ ] I was running DiscImageChef under FreeBSD [version here]...
+* [ ] I was running DiscImageChef under macOS [version here]...
+* [ ] ...using .NET Framework [version here]...
+* [ ] ...using .NET Core [version here]...
+* [ ] ...using Mono [version here]...
+* [ ] ...in 32-bit
+* [ ] ...in 64-bit
+
+### Description
+
+[Description of the bug or feature]
+
+### Exact command line used:
+
+`DiscImageChef [command] [parameters]`
+
+### Expected behavior:
+[What you expected to happen]
+
+### Actual behavior:
+[What actually happened]
+
+### If command was expected to work with a device fill this:
+
+* **Manufacturer**:
+* **Model**:
+* **Bus**:
+    * [ ] Parallel ATA
+    * [ ] Serial ATA
+    * [ ] SCSI (any)
+    * [ ] ATAPI (mark above if parallel or serial)
+    * [ ] USB
+    * [ ] FireWire
+    * [ ] PCMCIA
+    * [ ] SecureDigital
+    * [ ] MultiMediaCard
+    
+### Output of command execution with debug output enabled
+```
+Paste here the whole output of the executed command when you append '-d' to your command line parameters
+```