Add issue templates

Author: R-Wright-1

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,56 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**PICRUSt2 version**
+The version of PICRUSt2 that you are having issues with.
+
+**Operating system**
+Please give full details of the system that you are using, including the available storage space and RAM. 
+
+If your issue relates to either installation or running PICRUSt2, please fill in the relevant section below. Otherwise, please provide as much detail as possible about the command that you are trying to run, including screenshots or attachments of your terminal output (please do not paste terminal output directly into the text area). 
+
+## Installation bugs
+
+**Installation method**
+Please include the commands that you have run to try to install PICRUSt2.
+
+**Terminal output**
+Please attach your full terminal output from this error as a text file. 
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.
+
+## Issues with running PICRUSt2
+
+**Your data**
+If your issue relates to running PICRUSt2, please provide details of your project, *i.e.* how many ASVs and how many samples you have. 
+
+**Command run**
+The exact command that you are trying to run. 
+
+**Expected behaviour**
+A clear and concise description of what you expected to happen.
+
+**Troubleshooting steps taken**
+Please describe the steps that you have taken to try to troubleshoot this issue. Please note that you should first of all try running PICRUSt2 with the tutorial data as described [here](https://github.com/picrust/picrust2/wiki/Installation#test-installation-with-real-data) to determine whether this is an issue with your PICRUSt2 installation or with your data. 
+
+**Terminal output**
+Please attach your full terminal output from this error as a text file. 
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.