initial note posting

Signed-off-by: William Casarin <jb55@jb55.com>

src/post.rs

@@ -0,0 +1,17 @@
+use nostrdb::NoteBuilder;
+
+pub struct NewPost {
+    pub content: String,
+    pub account: usize,
+}
+
+impl NewPost {
+    pub fn to_note(&self, seckey: &[u8; 32]) -> nostrdb::Note {
+        NoteBuilder::new()
+            .kind(1)
+            .content(&self.content)
+            .sign(seckey)
+            .build()
+            .expect("note should be ok")
+    }
+}