added participant creation

src/participant.typ

@@ -1,9 +1,12 @@
-#let _par(name, display-name: auto, start-at: 0) = {
+#import "@preview/cetz:0.2.2": draw
+#import "consts.typ": *
+
+#let _par(name, display-name: auto, from-start: true) = {
   return ((
     type: "par",
     name: name,
     display-name: if display-name == auto {name} else {display-name},
-    start-at: start-at
+    from-start: from-start
   ),)
 }
 
@@ -14,4 +17,15 @@
     }
   }
   return false
+}
+
+#let render(x-pos, p, y: 0) = {
+  draw.content(
+    (x-pos.at(p.i), y),
+    p.display-name,
+    name: p.name,
+    frame: "rect",
+    padding: PAR-PAD,
+    anchor: "south"
+  )
 }