add initial hof

examples/gno.land/r/gnoland/hof/gno.mod

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+module gno.land/r/gnoland/hof

examples/gno.land/r/gnoland/hof/hof.gno

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+// Package hof represents the gno.land hall of fame realm.
+// It contains a permanent exhibition of items in the hall of fame,
+// a possibility to host temporary ones created by its admins.
+package hof
+
+import (
+	"github.com/gnolang/gno/examples/gno.land/p/demo/avl"
+	"github.com/gnolang/gno/examples/gno.land/p/demo/seqid"
+	"time"
+)
+
+var (
+	permanent *Exhibition
+	temporary *avl.Tree
+	idCounter seqid.ID
+)
+
+type Exhibition struct {
+	id seqid.ID
+
+	title       string
+	description string
+	startTime   time.Time // given in RFC3339
+	endTime     time.Time // end time of the event, given in RFC3339
+	items       *avl.Tree
+}
+
+func init() {
+	permanent = &Exhibition{
+		id:          idCounter.Next(),
+		title:       "Hall Of Fame",
+		description: "gno.land's hall of fame!",
+		startTime:   time.Now(),
+		endTime:     time.Now(),
+		items:       avl.NewTree(),
+	}
+
+	temporary = avl.NewTree()
+
+}
+
+func Register() {
+	permanent
+
+}
+
+func RegisterTemp(id seqid.ID) {
+
+}