Create manual_setup.md

Added the manual setup instructions to documentation folder.

documentation/manual_setup.md

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+## How to build
+
+First, you will need to setup [Modern SDK](https://crashoveride95.github.io/n64hbrew/modernsdk/startoff.html).
+
+After installing modern sdk you will want to also install
+
+```sh
+sudo apt install libnustd
+```
+
+Next, you will need to install the latest version of Blender 3.6 LTS (please don't use e.g. 4.x, only 3.6.x will work correctly). Then set the environment variable `BLENDER_3_6` to be the absolute path where the Blender 3.6 executable is located on your system.
+
+```sh
+sudo snap install blender --channel=3.6lts/stable --classic
+```
+
+e.g. add this to your ~/.bashrc if you used snap (or you can use `which blender` to find the path of Blender 3.6)
+
+```bash
+export BLENDER_3_6="/snap/bin/blender"
+```
+
+<br />
+
+You will need to install Python `vpk`:
+
+```sh
+sudo apt install pipx
+pipx ensurepath
+pipx install vpk
+```
+
+<br />
+
+Clone the Portal64 repo or download the zip.
+
+```sh
+sudo apt install git
+git clone https://github.com/lambertjamesd/portal64.git
+cd portal64
+```
+Setup and install dependencies for `skelatool64`
+
+```sh
+echo "deb [trusted=yes] https://lambertjamesd.github.io/apt/ ./" \
+    | sudo tee /etc/apt/sources.list.d/lambertjamesd.list
+sudo apt update
+sudo apt install vtf2png sfz2n64 mpg123 sox imagemagick unzip
+``
+```
+Install ffmpeg 4.3.1
+```
+sudo snap install ffmpeg  # version 4.3.1
+
+```
+
+<br />
+
+Install lua5.4 (You may need to remove other installed versions first, skelatool64 needs to be built with luac 5.4!)
+
+```sh
+sudo apt install lua5.4 liblua5.4-dev liblua5.4-0
+```
+<br />
+
+You will need to install nodejs. You can use apt for this
+
+```sh
+sudo apt install nodejs
+```