Update issue templates

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: " Suggest a new feature to enhance Cantera"
+title: ''
+labels: feature-request
+assignees: ''
+
+---
+
+**Abstract**
+
+A brief description of the proposed change.
+
+**Motivation**
+
+Describe the need for the proposed change:
+
+* What problem is it trying to solve?
+* Who is affected by the change?
+* Why is this a good solution?
+
+**Description**
+
+A detailed description of the proposed change. This may include examples of how the new feature would be used, intended use cases, and pseudo-code illustrating its use.
+
+**Alternatives**
+
+If any alternative solutions to solving the same problem have been considered, describe them here, along with a justification for the chosen approach.
+
+**References**
+
+Links to related Pull Requests, GitHub Issues, Users' Group topics, or other relevant material.

.github/ISSUE_TEMPLATE/work-in-progress.md

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+---
+name: Work in progress
+about: Describe a new feature that you are currently working on
+title: ''
+labels: work-in-progress
+assignees: ''
+
+---
+
+**Abstract**
+
+A brief description of the work being done.
+
+**Motivation**
+
+Describe the need for the work being done:
+
+* What problem is it trying to solve?
+* Who is affected by the change?
+* Why is this a good solution?
+
+**Description**
+
+A detailed description of the work being done. This may include examples of how the new feature will be used, intended use cases, and pseudo-code illustrating its use.
+
+**Alternatives**
+
+If any alternative solutions to solving the same problem have been considered, describe them here, and explain why the chosen approach is preferred.
+
+**References**
+
+Links to a development branch in your fork of the Cantera repository, Pull Requests, GitHub Issues, Users' Group topics, or other relevant material.