docs: adds an installation guide

docs/pages/installation.md

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+---
+title: 'Installation guide'
+weight: 30
+---
+
+## Glee Installation
+
+Before installing Glee into your project, make sure you have pre-installed [AsyncAPI CLI](https://github.com/asyncapi/cli) tool.
+
+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
+```
+
+> For more information on how to install the AsynAPI CLI, you can review the [CLI installation guide](https://www.asyncapi.com/docs/tools/cli/installation).

docs/pages/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:
+
+- Glee ensures your code and AsyncAPI definition are on par, eliminating the problem of outdated documentation.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.

docs/pages/usage.md

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+---
+title: 'Usage'
+weight: 20
+---
+
+Glee as a spec-driven framework, makes it easier to work with applications in Generating documentation.
+
+While working with the CLI, it's always necessary to have docs and code always in sync. Glee will automatically generate documentation for your application or you can also generate your documentation yourself by running:
+
+```
+glee docs
+```
+
+<!-- TODO -->