Add issue template for mmseqs

.github/ISSUE_TEMPLATE.md

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+## Expected Behavior
+
+## Current Behavior
+
+## Steps to Reproduce (for bugs)
+Please make sure to execute the reproduction steps with newly recreated and empty tmp folders.
+
+## MMseqs Output (for bugs)
+Please make sure to also post the complete output of MMseqs. You can use gist.github.com for large output.
+
+## Context
+Providing context helps us come up with a solution and improve our documentation for the future.
+
+## Your Environment
+Include as many relevant details about the environment you experienced the bug in.
+* Git commit used (The string after "MMseqs Version:" when you execute MMseqs without any parameters):
+* Which MMseqs version was used (Statically-compiled, self-compiled, Homebrew, etc.):
+* For self-compiled and Homebrew: Compiler and Cmake versions used and their invocation:
+* Server specifications (especially CPU support for AVX2/SSE and amount of system memory):
+* Operating system and version: