Add options fig code in examples.

examples/options_fig.py

@@ -0,0 +1,28 @@
+import pyranges as pr
+import pyranges_plot as prp
+
+prp.set_engine("plt")
+prp.set_id_col("transcript_id")
+
+p = pr.PyRanges(
+    {
+        "Chromosome": ["1"] * 9,
+        "Strand": ["+", "+", "-", "-", "-", "+", "+", "+", "-"],
+        "Start": [i * 100 for i in [5, 35, 3, 13, 35, 45, 49, 56, 60]],
+        "End": [i * 100 for i in [15, 37, 6, 17, 39, 47, 51, 57, 67]],
+        "transcript_id": ["t1", "t1", "t2", "t2", "t2", "t3", "t3", "t3", "t4"],
+    }
+)
+
+prp.plot(
+    p,
+    colormap="Alphabet",
+    arrow_size=0.03,
+    shrink=True,
+    shrink_threshold=500,
+    text=True,
+    text_pad=100,
+    title_size=25,
+    exon_border="black",
+    text_size=15,
+)