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Added getting started note

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Electrical/README.md
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@ -38,3 +38,62 @@ AMS unit.
### Status
Implementation done.
# Getting started building or modifying
## Tools
### Kicad
Install the [KiCad](http://www.kicad-pcb.org/) program to edit the schematic or PCB.
KiCad documentation and forums:
* https://kicad-pcb.org/help/documentation/#_getting_started
* https://forum.kicad.info/
* https://www.reddit.com/r/KiCad/
* https://en.wikipedia.org/wiki/KiCad
### Simulator
If you want to simulate parts of the circuit you also need a simulator. This is
highly recommended! This saves a *lot* of troubleshooting and makes you find
solutions you otherwise would not have found.
[Electronic circuit simulation](https://en.wikipedia.org/wiki/Electronic_circuit_simulation)
using computers have a long history. Many of them have origins directly or indirectly
related to the classic SPICE simulator (e.g. [Ngspice](http://ngspice.sourceforge.net)).
At the core they work similar to source code compilers - you give it a text file
describing the circuit and it produces a textual simulation result. Some of the simulators
are intended to be used just in text mode while other have a graphical frontend where
you are able to draw the circuit like in a schematic editor:
* [QUCS](http://qucs.sourceforge.net/) - Quite Universal Circuit Simulator.
* [QUCS-S](https://ra3xdh.github.io/) - A qucs version using ngspice as simulation backend. This one has been used for the simulations for board 3.
* [eSim](http://esim.fossee.in/).
* [Other alternatives](https://en.wikipedia.org/wiki/List_of_free_electronics_circuit_simulators).
### Git
While it is possible to download the content from this repository as a compresset
zip file, you want to use git to fetch the content. For Linux install depending on
distribution with
```
apt-get install git # debian, ubuntu, etc
dnf install git # fedora
yum install git # rhel, centos
```
For windows the most convenient option is to install [git for windows](https://git-scm.com/download/win).
To download the source of this repository run:
```
git clone https://github.com/roarfred/AmsToMqttBridge
cd AmsToMqttBridge
git submodule init
git submodule update --recursive
```