Update issue templates

Author: scivision

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,18 @@
+---
+name: Bug report
+about: What's wrong?
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+
+**System details**
+
+NetCDF4 Fortran library relies upon the NetCDF4 C library.
+
+* operating system (Mac, Linux, Windows)
+* NetCDF4 library version for C **and** Fortran (example: 4.7.3 C, 4.5.2 Fortran)
+* compiler version (example: GCC 9.3.0, Intel 19.1)