Update issue templates (#138)

.github/ISSUE_TEMPLATE/add-species-database.md

@@ -0,0 +1,21 @@
+---
+name: Add species database
+about: Propose a species database to be added
+title: "[database]"
+labels: enhancement
+assignees: johnlees
+
+---
+
+Please specify:
+- Is this a request for us to make a new database?
+- Is this a database you have fitted, and wish us to add?
+
+If the latter:
+- What is the species?
+- How many genomes are included?
+- Are the genomes public?
+- Are the genomes published?
+- How did you obtain your fit?
+
+Please attach all necessary files in a .tar.gz archive, if possible

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,18 @@
+---
+name: Bug report
+about: Had a problem with running PopPUNK or sketchlib
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Versions**
+<!-- Please give the version of PopPUNK and pp-sketchlib used, which can be found be running `poppunk --version` and `poppunk_sketch --version` respectively.
+Alternatively, please post the output of `conda list` in your environment -->
+
+**Command used and output returned**
+<!-- Please give the command you ran, and paste the output from the terminal. Also, describe your data, if appropriate. -->
+
+**Describe the bug**
+<!-- Describe the bug, and what you expected to happen. -->