Update issue and pr templates

.github/ISSUE_TEMPLATE/bug_report.yaml

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+name: 🐞 Bug Report
+description: Create a bug report to help us improve
+title: "bug: "
+body:
+  - type: textarea
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of the bug, as well as what you expected to happen when encountering it.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: To reproduce
+      description: Describe how to reproduce your bug. Please provide detailed steps, code snippets, reproduction repos etc.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Additional information
+      description: Add any other information related to the bug here, screenshots if applicable.
+  - type: dropdown
+    id: contribute
+    attributes:
+      label: Are you interested to contribute a fix for this bug?
+      description: If this is a confirmed bug, the maintainers are happy to support with guidance and review.
+      options:
+        - "No"
+        - "Yes"
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/enhancement.yaml

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+name: ✨Enhancement
+description: Create a request for a new feature
+labels: ["enhancement"]
+body:
+  - type: textarea
+    attributes:
+      label: Description of the feature
+      description: Please provide a clear and concise description of the feature you would like to see added.
+    validations:
+      required: true
+

.github/ISSUE_TEMPLATE/new_dataset.yaml

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+name: 🗃New dataset
+description: Create a request for a new dataset to be added to MTEB
+title: "dataset: "
+labels: ["new dataset"]
+body:
+  - type: textarea
+    attributes:
+      label: dataset link on Hugging dataset
+      description: Please provide a link to the dataset on Hugging Face.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Arxiv link
+      description: If the dataset is based on a paper, please provide a link to the paper on Arxiv or another academic repository.

.github/ISSUE_TEMPLATE/new_model.yaml

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+name: 🤖New model
+description: Create a request for a new model to be added to MTEB
+title: "model: "
+labels: ["new model"]
+body:
+  - type: textarea
+    attributes:
+      label: Model link on Hugging Face
+      description: Please provide a link to the model on Hugging Face. If the model is closed-source, please provide a link to the model provider or documentation.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Arxiv link
+      description: If the model is based on a paper, please provide a link to the paper on Arxiv or another academic repository.

.github/PULL_REQUEST_TEMPLATE/bug_fix.md

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+<!-- add `fix:` to the title of this PR -->
+Fix <issue number>
+
+<!-- add a description of the bug and how this PR fixes it -->
+# Description

.github/PULL_REQUEST_TEMPLATE/new_dataset.md

@@ -0,0 +1,6 @@
+<!-- add `dataset:` to the title of this PR -->
+Fix <issue number>
+
+- [ ] I did not add a dataset, or if I did, I added the [dataset checklist](https://github.com/embeddings-benchmark/mteb/blob/main/docs/adding_a_dataset.md#submit-a-pr) to the PR and completed it.
+
+# Description

.github/PULL_REQUEST_TEMPLATE/new_model.md

@@ -0,0 +1,9 @@
+<!-- add `model:` to the title of this PR -->
+Fix <issue number>
+
+- [ ] I did not add a model, or if I did, I added the [model checklist](https://github.com/embeddings-benchmark/mteb/blob/main/docs/adding_a_model.md#submitting-your-model-as-a-pr) to the PR and completed it.
+
+<!-- add a description of the bug and how this PR fixes it -->
+# Description
+
+

.github/pull_request_template.md

@@ -1,7 +1,5 @@
+Please go to the `Preview` tab and select the appropriate sub-template:
 
-
-### Checklist
-<!-- please do not delete this checklist -->
-
-- [ ] I did not add a dataset, or if I did, I added the [dataset checklist](https://github.com/embeddings-benchmark/mteb/blob/main/docs/adding_a_dataset.md#submit-a-pr) to the PR and completed it.
-- [ ] I did not add a model, or if I did, I added the [model checklist](https://github.com/embeddings-benchmark/mteb/blob/main/docs/adding_a_model.md#submitting-your-model-as-a-pr) to the PR and completed it.
+* [Fixing a bug or enchatment](?expand=1&template=bug_fix.md)
+* [Adding new dataset](?expand=1&template=new_dataset.md)
+* [Adding new model](?expand=1&template=new_model.md)