Documentation: Run on Windows without install

[eabase]

Hey!
This is an absolutely amazing piece of software!
An incredibly beautiful, intuitive & clean design.
Thank you! 💯 💖

I got my NanoVNA, and was quite sad to play with the plastic feeling of the onscreen touch pad/pen.
Loading up this software suddenly makes it feel like a professional piece of lab equipment.

I also decided I didn't want to install it blindly after seeing all the false malware flags in VT.
So I ran it from command line in Powershell. Works great!

Here are the steps for Python 3.12.7. Please add to the installation instructions here:

• https://github.com/NanoVNA-Saver/nanovna-saver/blob/windows_build/docs/INSTALLATION.md

# Requirements: Powershell core, git for windows, Python 3.12.7
# Run the following from an Admin Powershell in the download directory
git clone https://github.com/NanoVNA-Saver/nanovna-saver.git
cd nanovna-saver

# Update pip and install venvlink
pip list --outdated
python -m pip install --upgrade pip
pip install -U venvlink

# mkven is an alias for: "python -m venvlink"
mkven -S nanovna 
activate

cat .\requirements.txt
pip install -U numpy scipy Cython setuptools setuptools-scm sip pyserial PyQt6 PyQt6-sip

# To run:
python nanovna-saver.py &

Then, to connect you NanoVNA:

1. Attach the NanoVNA from your PC's USB port to USB-C port on device.
2. Turn on the device
3. Open Device Manager: hdwwiz.cpl
4. Look for a: "USB Serial Device (COM <n>)"
5. Take note of the COM port number <n>
6. The USB VID:PID seem to be: 0483:5740 for this device.
7. Start App and connect.

Enjoy!

_{PS. Pip packages seem to work with latest versions, so no need to use the requirements file.}