Add a feature tranfer template

.github/ISSUE_TEMPLATE/feature-transfer.md

@@ -0,0 +1,38 @@
+---
+name: Feature Transfer to PySCF Core
+about: Propose the migration of a feature from PySCF-Forge to the PySCF core repository
+title: "[FEATURE TRANSFER] Title of feature transfer proposal"
+labels: ''
+assignees: ''
+
+---
+
+### Feature Description
+Provide a clear and concise description of the feature being proposed for transfer. Include:
+- The scientific background or motivation.
+- Links to reference papers, original publications, or relevant materials.
+- The current status and functionality in PySCF-Forge.
+- Any limitations or known issues.
+
+### Relevant Modules and Files
+List all relevant Python modules, C files and C-extension modules involved. Include:
+- Existing file names and locations in PySCF-Forge.
+- Proposed new file paths or module names in PySCF.
+- Any anticipated dependencies on internal APIs or third-party packages.
+
+### Documentation
+Provide links to any existing documentation, tutorials, or demos.
+- Link to the corresponding page in https://github.com/pyscf/pyscf.github.io if avaiable.
+- If not yet documented, provide a brief plan or link to a draft PR in https://github.com/pyscf/pyscf.github.io .
+
+### Long-term Maintenance Plan
+Assign or propose a long-term maintainer for this feature.
+
+### Additional Context
+Include any further information that may be helpful for reviewing this transfer, such as:
+- Benchmark results or performance metrics.
+- Related issues or discussions.
+- Compatibility considerations with other PySCF components.
+
+### Authorship
+Please clarify authorship info, including the names of contributors, and email address/organization if applicable.

CONTRIBUTING.md

@@ -70,7 +70,8 @@ maintainers at https://github.com/orgs/pyscf/people.
 
 After a feature has been added to PySCF-forge for over 6 months, developers can
 open an issue to request to transfer the feature to the PySCF core branch.
-The proposal template can be accessed at (TBD). The proposal will be reviewed
+A Feature Transfer Proposal template is available when creating a new GitHub
+issue. The proposal will be reviewed
 during the PySCF board meetings, held approximately every 3 months. If it is decided that
 the feature is incompatible with the requirements of the core branch, the board may recommend
 additional modifications, or that the feature be removed from PySCF-forge.