Accept submissions via form (#8)

.github/ISSUE_TEMPLATE/arxiv.yml

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+name: Submit an arXiV URL
+description: You have an arXiV URL for a research item
+title: "[Submission/arXiV]: "
+labels: [submission]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to make a submission.
+  - type: input
+    id: url
+    attributes:
+      label: URL
+      description: Please provide an arXiV URL
+      placeholder: https://arxiv.org/abs/2102.12627
+    validations:
+      required: true
+  - type: input
+    id: game
+    attributes:
+      label: Game
+      description: What game is this for?
+    validations:
+      required: true
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/captn3m0/boardgame-research/blob/master/CONTRIBUTING.md)
+      options:
+        - label: I agree to follow this project's Code of Conduct
+          required: true

.github/ISSUE_TEMPLATE/doi.yml

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+name: Submit a Research via a DOI
+description: You have a DOI for a research
+title: "[Submission/DOI]: "
+labels: [submission]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to make a submission.
+  - type: input
+    id: doi
+    attributes:
+      label: DOI
+      description: Please provide a DOI
+      placeholder: http://doi.org/10.1126/science.1239918
+    validations:
+      required: true
+  - type: input
+    id: game
+    attributes:
+      label: Game
+      description: What game is this for?
+    validations:
+      required: true
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/captn3m0/boardgame-research/blob/master/CONTRIBUTING.md)
+      options:
+        - label: I agree to follow this project's Code of Conduct
+          required: true

.github/ISSUE_TEMPLATE/url.yml

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+name: Submit another research item
+description: You have URL for a research item, but you couldn't find a DOI or arXiV URL for the same.
+title: "[Submission/URL]: "
+labels: [submission]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to make a submission. Please only use this if you couldn't find a DOI for the research. Try to avoid low-information research (posters/presentations) unless the topic is not covered elsewhere in a better medium.
+  - type: input
+    id: url
+    attributes:
+      label: URL
+      description: Please provide a URL to the research item
+      placeholder: https://arxiv.org/abs/2102.12627
+    validations:
+      required: true
+  - type: input
+    id: game
+    attributes:
+      label: Game
+      description: What game is this for?
+    validations:
+      required: true
+  - type: textarea
+    id: info
+    attributes:
+      label: Notes
+      description: Any other information about this you'd like to add?
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/captn3m0/boardgame-research/blob/master/CONTRIBUTING.md)
+      options:
+        - label: I agree to follow this project's Code of Conduct
+          required: true