docs: add installation section (#912)

* Implemented requirements

* Added one-step installation

* Finished section

docs/docs/installation/requirements.md

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+---
+sidebar_position: 1
+---
+
+
+# Requirements
+Hardware and software requirement for Immich
+
+## Software
+
+- [Docker](https://docs.docker.com/get-docker/)
+- [Docker Compose](https://docs.docker.com/compose/install/)
+
+:::info Podman
+You can also use Podman to run the application, however, additional configurations might required on your end.
+:::
+
+## Hardware
+
+- **OS**: Preferred unix-based operating system (Ubuntu, Debian, MacOS...etc). Windows works too with [Docker Desktop on Windows](https://docs.docker.com/desktop/install/windows-install/)
+- **Ram**: At least 2GB, preferred 4GB.
+- **Core**: At least 2 cores, preferred 4 cores.
+
+## Installation methods
+
+There are a couple installation method that you can use to install the application. You can choose the one that suits you the best.
+
+1. [One-step installation (Evaluation only)](/docs/installation/one-step-installation)
+2. **[Docker Compose with manual configuration (Recommended)](/docs/installation/recommended-installation)**
+3. [Portainer](/docs/installation/portainer-installation)
+4. [Unraid (Community contribution)](/docs/installation/unraid-installation)