Add GitHub issue templates

.github/ISSUE_TEMPLATE/blank_issue.md

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+---
+name: Blank Issue
+about: Create a blank issue.
+---

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Create a bug report for Rust.
+labels: C-bug
+---
+<!--
+Thank you for filing a bug report! 🐛 Please provide a short summary of the bug,
+along with any information you feel relevant to replicating the bug.
+-->
+
+I tried this code:
+
+```rust
+<code>
+```
+
+I expected to see this happen: *explanation*
+
+Instead, this happened: *explanation*
+
+### Meta
+<!--
+If you're using the stable version of the compiler, you should also check if the
+bug also exists in the beta or nightly versions.
+-->
+
+`rustc --version --verbose`:
+```
+<version>
+```
+
+<!--
+Include a backtrace in the code block by setting `RUST_BACKTRACE=1` in your
+environment. E.g. `RUST_BACKTRACE=1 cargo build`.
+-->
+<details><summary>Backtrace</summary>
+<p>
+
+```
+<backtrace>
+```
+
+</p>
+</details>

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Rust Programming Language Forum
+    url: https://users.rust-lang.org
+    about: Please ask and answer questions about Rust here.

.github/ISSUE_TEMPLATE/ice.md

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+---
+name: Internal Compiler Error
+about: Create a report for an internal compiler error in rustc.
+labels: C-bug, I-ICE, T-compiler
+---
+<!--
+Thank you for finding an Internal Compiler Error! 🧊  If possible, try to provide
+a minimal verifiable example. You can read "Rust Bug Minimization Patterns" for
+how to create smaller examples.
+
+http://blog.pnkfx.org/blog/2019/11/18/rust-bug-minimization-patterns/
+
+-->
+
+### Code
+
+```
+<code>
+```
+
+
+### Meta
+<!--
+If you're using the stable version of the compiler, you should also check if the
+bug also exists in the beta or nightly versions.
+-->
+
+`rustc --version --verbose`:
+```
+<version>
+```
+
+### Error output
+
+```
+<output>
+```
+
+<!--
+Include a backtrace in the code block by setting `RUST_BACKTRACE=1` in your
+environment. E.g. `RUST_BACKTRACE=1 cargo build`.
+-->
+<details><summary><strong>Backtrace</strong></summary>
+<p>
+
+```
+<backtrace>
+```
+
+</p>
+</details>
+

.github/ISSUE_TEMPLATE/tracking_issue.md

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+---
+name: Tracking Issue
+about: A tracking issue for a feature in Rust.
+title: Tracking Issue for XXX
+labels: C-tracking-issue
+---
+<!--
+Thank you for creating a tracking issue! 📜 Tracking issues are for tracking a
+feature from implementation to stabilisation. Make sure to include the relevant
+RFC for the feature if it has one. Otherwise provide a short summary of the
+feature and link any relevant PRs or issues, and remove any sections that are
+not relevant to the feature.
+
+Remember to add team labels to the tracking issue.
+For a language team feature, this would e.g., be `T-lang`.
+Such a feature should also be labeled with e.g., `F-my_feature`.
+This label is used to associate issues (e.g., bugs and design questions) to the feature.
+-->
+
+This is a tracking issue for the RFC "XXX" (rust-lang/rfcs#NNN).
+The feature gate for the issue is `#![feature(FFF)]`.
+
+### About tracking issues
+
+Tracking issues are used to record the overall progress of implementation.
+They are also uses as hubs connecting to other relevant issues, e.g., bugs or open design questions.
+A tracking issue is however *not* meant for large scale discussion, questions, or bug reports about a feature.
+Instead, open a dedicated issue for the specific matter and add the relevant feature gate label.
+
+### Steps
+<!--
+Include each step required to complete the feature. Typically this is a PR
+implementing a feature, followed by a PR that stabilises the feature. However
+for larger features an implementation could be broken up into multiple PRs.
+-->
+
+- [ ] Implement the RFC (cc @rust-lang/XXX -- can anyone write up mentoring
+      instructions?)
+- [ ] Adjust documentation ([see instructions on rustc-guide][doc-guide])
+- [ ] Stabilization PR ([see instructions on rustc-guide][stabilization-guide])
+
+[stabilization-guide]: https://rust-lang.github.io/rustc-guide/stabilization_guide.html#stabilization-pr
+[doc-guide]: https://rust-lang.github.io/rustc-guide/stabilization_guide.html#documentation-prs
+
+### Unresolved Questions
+<!--
+Include any open questions that need to be answered before the feature can be
+stabilised.
+-->
+
+XXX --- list all the "unresolved questions" found in the RFC to ensure they are
+not forgotten
+
+### Implementation history
+
+<!--
+Include a list of all the PRs that were involved in implementing the feature.
+-->