docs: adds an installation guide

docs/installation.md

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+---
+title: 'Installation guide'
+weight: 30
+---
+
+## Glee Installation
+
+Before installing Glee framework into your project, make sure you have pre-installed AsyncAPI CLI tool under the hood.
+
+The best way to get started with Glee is by using AsyncAPI CLI, which sets up everything automatically for you. 
+To create a project, run:
+```sh
+asyncapi new glee
+```
+
+<Remember>
+For more information on how to install AsynAPI CLI, you can review <a href="https://www.asyncapi.com/docs/tools/cli/installation">CLI installation documentation</a>.
+</Remember>

docs/intro.md

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+---
+title: 'Introduction'
+weight: 20
+---
+
+[Glee][https://github.com/asyncapi/glee) is a spec-first framework that helps you build server-side applications. It leverages the AsyncAPI specification to make you more productive:
+
+- It makes sure your code and AsyncAPI definition are on par, eliminating the problem of outdated documentation. Glee takes care of this automatically for you.
+- Glee lets you focus on what matters and handles the rest for you. You only write the code for your business use-case. Glee takes care of performance, scalability, resilience, and everything you need to make your application production-ready.