completed README

gallery/readme/boilerplate.typ

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+#import "/src/lib.typ" as chronos
+
+#set page(
+  width: auto,
+  height: auto,
+  margin: 0.5cm
+)
+
+#chronos.diagram({
+  import chronos: *
+  _par("Alice")
+  _par("Bob")
+})

gallery/readme/lifelines.typ

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+#import "/src/lib.typ" as chronos
+
+#set page(
+  width: auto,
+  height: auto,
+  margin: 0.5cm
+)
+
+#chronos.diagram({
+  import chronos: *
+  _par("A", display-name: "Alice")
+  _par("B", display-name: "Bob")
+  _par("C", display-name: "Charlie")
+  _par("D", display-name: "Derek")
+
+  _seq("A", "B", comment: "hello", enable-dst: true)
+  _seq("B", "B", comment: "self call", enable-dst: true)
+  _seq("C", "B", comment: "hello from thread 2", enable-dst: true, lifeline-style: (fill: rgb("#005500")))
+  _seq("B", "D", comment: "create", create-dst: true)
+  _seq("B", "C", comment: "done in thread 2", disable-src: true, dashed: true)
+  _seq("B", "B", comment: "rc", disable-src: true, dashed: true)
+  _seq("B", "D", comment: "delete", destroy-dst: true)
+  _seq("B", "A", comment: "success", disable-src: true, dashed: true)
+})

gallery/readme/simple_sequence.typ

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+#import "/src/lib.typ" as chronos
+
+#set page(
+  width: auto,
+  height: auto,
+  margin: 0.5cm
+)
+
+#chronos.diagram({
+  import chronos: *
+  _par("Alice")
+  _par("Bob")
+
+  _seq("Alice", "Bob", comment: "Hello")
+  _seq("Bob", "Bob", comment: "Think")
+  _seq("Bob", "Alice", comment: "Hi")
+})