Add some test files to tests/ directory

tests/.gitignore

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+*.gv
+*.html
+*.png
+*.svg
+*.tsv
+*.csv
+*.html
+*.pdf

tests/rendering/00_minimal.yml

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+connectors:
+  X1:
+    pincount: 4
+  X2:
+    pincount: 4
+  X3:
+    pincount: 2
+  F:
+    style: simple
+
+cables:
+  C1:
+    wirecount: 4
+  W2:
+    wirecount: 2
+    category: bundle
+
+connections:
+  -
+    - X1: [1-4]
+    - C1: [1-4]
+    - X2: [1-4]
+  -
+    - X3: [1,2]
+    - W2: [1,2]
+    - F.

tests/rendering/01_color_single.yml

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+connectors:
+  X1:  # shorthand color codes
+    color: BK
+    pincount: 4
+    pincolors: [RD, YE, GN, BU]
+  X2:  # HTML color codes
+    color: 0xFFFFFF
+    pincount: 4
+    pincolors: [0xFF8000, 0x00FF80, 0x8000FF]  # no color for last pin
+  X3:  # HTML color names
+    color: red
+    pincount: 4
+    pincolors: [deeppink, tomato, salmon, indianred]
+  F:
+    style: simple
+    color: BN
+
+cables:
+  C1:
+    wirecount: 4
+    color: GY
+    colors: [OG, OL, LB, PK]
+
+connections:
+  -
+    - X1: [1-4]
+    - C1: [1-4]
+    - X2: [1-4]
+    - <--
+    - X3: [1-4]
+    - --
+    - F.

tests/rendering/02_color_multi.yml

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+connectors:
+  X1:
+    color: YEGN
+    pincount: 4
+    pincolors: [WHBK, BKWH, GNYE, GNWHRD]
+  X2:
+    color: 0xFFFFFF
+    pincount: 4
+    pincolors: [0xFF8000:0x80FF00, 0x00FF80, 0x8000FF]
+  X3:
+    color: red
+    pincount: 4
+    pincolors: [deeppink, tomato, salmon, indianred]
+  F:
+    style: simple
+    color: IVTQ
+
+cables:
+  C1:
+    wirecount: 4
+    colors: [RDYE, YEGN, GNBU, BURD]
+  C2:
+    wirecount: 4
+    colors: [0xFF8000:0x80FF00, YEGN, GNBU, BURD]
+
+connections:
+  -
+    - X1: [1-4]
+    - C1: [1-4]
+    - X2: [1-4]
+    - C2: [1-4]
+    - X3: [1-4]
+    - --
+    - F.