Bug report template

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Please provide a short, reproducible example of the error, for example:
+```
+import pyrtools as pt
+import imageio
+
+img = imageio.imread('DATA/Einstein.pgm'), dtype=torch.float32)
+pyr = pt.pyramids.LaplacianPyramid(img)
+# this raises an error
+recon_img = pyr.recon_pyr()
+```
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**System (please complete the following information):**
+ - OS: [e.g. Mac (with version), Ubuntu 18.04]
+ - Python version [e.g. 3.7]
+ - Pyrtools version [e.g. 1.0.1]
+
+**Additional context**
+Add any other context about the problem here.