Add manual installation instructions

docs/Manual_Installation.md

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+# Manual Installation
+
+These instructions are for people who want to run klipper on
+custom system that's not debian-based. Flashing steps are same
+as in [Installation](Installation.md) instruction.
+Naturally this instruction is for more advanced users.
+
+# Preparing for installation
+
+First you need to install required packages. This step is different
+for every other package manager and distribution so provided are
+debian packages and fiding package names for your distribution are
+up to you.
+
+```
+virtualenv python-dev libffi-dev build-essential libncurses-dev
+libusb-dev avrdude gcc-avr binutils-avr avr-libc stm32flash
+libnewlib-arm-none-eabi gcc-arm-none-eabi binutils-arm-none-eabi
+libusb-1.0 pkg-config
+```
+
+Next up as it's not recommended to run klipper as root you need to
+make user that will be running klipper
+
+```
+useradd -ms /bin/bash klippy
+usermod -aG tty klippy
+usermod -aG dialout klippy
+```
+
+Then after you login as a user you need to go to desired installation
+directory which can be home directory, clone klipper repo
+
+```
+git clone https://github.com/Klipper3d/klipper.git
+```
+
+At this point it would be best to follow step second step in [Installation](Installation.md#obtain-a-klipper-configuration-file)
+and obtain the configuration file.
+
+# Creating python virtual environment
+
+We need to create python virtual environment now. Place for it is
+entirely up to you but it has to be done from user and accessible.
+
+```
+# Assuming we're in desired directory
+virtualenv .
+# Replace klipper_directory with path to klipper
+./bin/pip install -r klipper_directory/scripts/klippy-requirements.txt
+```
+
+Python3 works fine, you might have issues with gcc13 and above.
+After successful installation you need to install service.
+Depending on if you're on systemd or init there are two options.
+
+## Init
+
+Copy `scripts/klipper-start.sh` from klipper directory to `/etc/init.d/klipper`
+then run: `sudo update-rc.d klipper defaults`
+Afterwards we need to create defaults file
+
+```
+sudo /bin/sh -c "cat > /etc/default/klipper" <<EOF
+# Configuration for /etc/init.d/klipper
+
+KLIPPY_USER=klippy
+
+KLIPPY_EXEC=venv_directory/bin/python
+
+KLIPPY_ARGS="klipper_directory/klippy/klippy.py config_directory/printer.cfg -l /tmp/klippy.log"
+
+EOF
+```
+
+Of course you need to adjust user, `venv_directory`, `klipper_directory`,
+`config_directory` and log file location.
+Then you can start it using `sudo /etc/init.d/klipper restart`
+
+## Systemd
+
+As a root, create file in `/etc/systemd/system/klipper.service` with content:
+
+```
+#Systemd service file for klipper
+[Unit]
+Description=Starts klipper on startup
+After=network.target
+
+[Service]
+Type=simple
+User=klippy
+RemainAfterExit=yes
+ExecStart=venv_directory/bin/python klipper_directory/klippy/klippy.py config_directory/printer.cfg -l /tmp/klippy.log
+Restart=always
+RestartSec=10
+
+[Install]
+WantedBy=multi-user.target
+```
+
+Of course you need to adjust user, `venv_directory`, `klipper_directory`,
+`config_directory` and log file location.
+Afterwards you can start it using `systemctl start klipper`.
+
+# Finally
+
+Installation is now done and you can proceed with rest
+of the [Installation](Installation.md).