Add WireViz syntax documentation

syntax.md

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+# WireViz Syntax
+
+## Main sections
+
+```yaml
+connectors:   # dictionary of all used connectors
+  X1:         # unique connector designator/name
+    ...       # connector attributes (see below)
+  X2:
+    ...
+  ...
+
+cables:       # dictionary of all used cables and wires
+  W1:         # unique cable designator/name
+    ...       # cable attributes (see below)
+  W2:
+    ...
+  ...
+
+connections:  # list of all connections to be made
+              # between cables and connectors
+  -
+    ...       # connection set (see below)
+  -
+    ...
+```
+
+## Connector attributes
+
+```yaml
+X1:
+  # general information about a connector (all optional)
+  type: <string>
+  subtype: <string>
+  color: <colorcode>
+  notes: <string>
+
+  # pinout information
+  # at least one of the following must be specified
+  pincount: <int>    # if omitted, is set to length of specified list(s)
+  pins: <List>       # if omitted, is autofilled with [1, 2, ..., pincount]
+  pinlabels: <List>  # if omitted, is autofilled with blanks
+
+  # product information (all optional)
+  manufacturer: <string>
+  manufacturer_part_number: <string>
+  internel_part_number: <string>
+
+  # rendering information
+  style: <style>         # optional; may be set to simple for single pin connectors
+  show_name: <bool>      # optional; defaults to true for regular connectors,
+                         # false for simple connectors
+  show_pincount: <bool>  # opional; defaults to true for regular connectors
+                         # false for simple connectors
+  hide_disconnected_pins: <bool>  # optional; defaults to false
+
+  # loops and shorts
+  loops: <List>  # TODO
+
+  # auto-generation
+  autogenerate: <bool>  # optional; defaults to false; see below
+
+```
+
+### Auto-generation of connectors
+
+<!-- TODO -->
+
+## Cable attributes
+
+<!-- TODO -->
+
+## Connection sets
+
+<!-- TODO -->
+
+## Color codes
+
+A color code is an uppercase, two character string.
+
+```
+TODO: list valid colors
+```
+
+## Multiline strings
+
+Accepted in the following fields:
+<!-- TODO -->
+
+How to use
+<!-- TODO -->
+
+Link to [yaml-multiline.info](https://yaml-multiline.info/)