Add repo and crate metadata (#5)

Add various pieces of crate-level and repo-level metadata, such as:

- PR / issue templates
- Contributing guidelines
- Security policy
- `html_root_url`s for crates
- Crate usage snippets in readmes

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,39 @@
+---
+name: Bug report
+about: Use this template for reporting issues
+title: ''
+labels: bug
+assignees: ''
+---
+
+### 🐛 Bug Report
+
+#### 📝 Description
+
+Provide a clear and concise description of the bug.
+
+#### 🔄 Reproduction Steps
+
+Steps to reproduce the behaviour
+
+#### 🤔 Expected Behavior
+
+Describe what you expected to happen.
+
+#### 😯 Current Behavior
+
+Describe what actually happened.
+
+#### 🖥️ Environment
+
+Any relevant environment details.
+
+#### 📋 Additional Context
+
+Add any other context about the problem here. If applicable, add screenshots to help explain.
+
+#### 📎 Log Output
+
+```
+Paste any relevant log output here.
+```

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,21 @@
+---
+name: Feature request
+about: Use this template for requesting features
+title: ''
+labels: feat
+assignees: ''
+---
+
+### 🌟 Feature Request
+
+#### 📝 Description
+
+Provide a clear and concise description of the feature you'd like to see.
+
+#### 🤔 Rationale
+
+Explain why this feature is important and how it benefits the project.
+
+#### 📋 Additional Context
+
+Add any other context or information about the feature request here.

.github/SECURITY.md

@@ -0,0 +1,74 @@
+# Security Policy
+
+We truly appreciate efforts to discover and disclose security issues responsibly!
+
+## Vulnerabilities
+
+If you'd like to report a security issue in the repositories of matter-labs organization, please proceed to our
+[Bug Bounty Program on Immunefi](https://era.zksync.io/docs/reference/troubleshooting/audit-bug-bounty.html#bug-bounty-program).
+
+## Other Security Issues
+
+We take an impact-first approach instead of a rules-first approach. Therefore, if you believe you found the impactful
+issue but can't report it via the Bug Bounty, please email us at
+[security@matterlabs.dev](mailto:security@matterlabs.dev).
+
+### PGP Key
+
+The following PGP key may be used to communicate sensitive information to developers:
+
+Fingerprint: `5FED B2D0 EA2C 4906 DD66 71D7 A2C5 0B40 CE3C F297`
+
+```
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+=xkM3
+-----END PGP PUBLIC KEY BLOCK-----
+```

.github/pull_request_template.md

@@ -0,0 +1,20 @@
+# What ❔
+
+<!-- What are the changes this PR brings about? -->
+<!-- Example: This PR adds a PR template to the repo. -->
+<!-- (For bigger PRs adding more context is appreciated) -->
+
+## Why ❔
+
+<!-- Why are these changes done? What goal do they contribute to? What are the principles behind them? -->
+<!-- Example: PR templates ensure PR reviewers, observers, and future iterators are in context about the evolution of repos. -->
+
+## Checklist
+
+<!-- Check your PR fulfills the following items. -->
+<!-- For draft PRs check the boxes as you complete them. -->
+
+- [ ] PR title corresponds to the body of PR (we generate changelog entries from PRs).
+- [ ] Tests for the changes have been added / updated.
+- [ ] Documentation comments have been added / updated.
+- [ ] Code has been formatted and linted using `cargo fmt` and `cargo clippy`.

CONTRIBUTING.md

@@ -0,0 +1,42 @@
+# Contribution Guidelines
+
+Hello! Thanks for your interest in `vise`! We welcome contributions from anyone on the internet, and are grateful
+for even the smallest of fixes!
+
+## Ways to contribute
+
+There are many ways to contribute:
+
+1. Open issues: if you find a bug, have something you believe needs to be fixed, or have an idea for a feature, please
+   open an issue.
+2. Add color to existing issues: provide screenshots, code snippets, and whatever you think would be helpful to resolve
+   issues.
+3. Resolve issues: either by showing an issue isn't a problem and the current state is ok as is or by fixing the problem
+   and opening a PR.
+4. Report security issues, see [our security policy](.github/SECURITY.md).
+5. [Join the team!](https://matterlabs.notion.site/Shape-the-future-of-Ethereum-at-Matter-Labs-dfb3b5a037044bb3a8006af2eb0575e0)
+
+## Fixing issues
+
+To contribute code fixing issues, please fork the repo, fix an issue, commit, add documentation as per the PR template,
+and the repo's maintainers will review the PR. See
+[here](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request-from-a-fork)
+for guidance how to work with PRs created from a fork.
+
+## Licenses
+
+If you contribute to this project, your contributions will be made to the project under both [Apache 2.0](LICENSE-APACHE)
+and [the MIT license](LICENSE-MIT).
+
+## Resources
+
+We aim to make it as easy as possible to contribute. This is still WIP, and we're happy for contributions
+and suggestions here too. Some resources to help:
+
+1. Developer docs can be found in [repo's readme](README.md)
+
+## Code of Conduct
+
+Be polite and respectful.
+
+### Thank you