Update issue templates

.github/ISSUE_TEMPLATE/new-preset-suggestion.md

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+---
+name: New preset suggestion
+about: Suggest new preset
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Dataset details**
+Name, link to example data, and similar.
+
+**Suggested column name mapping**
+Provide your preferred method of mapping the column names in the CSV file to the supported MolecularEntity properties.
+
+**Value delimiter**
+Value delimiter for this file (see --value-delimiter option).
+
+**Present name**
+Suggested preset name
+
+**Additional context**
+Add any other context or attachments about your suggested preset name