add fetch script and populate content

waku/standards/core/17/images/rln-relay-reg-with-tree-on-chain.msc

@@ -0,0 +1,33 @@
+# Sequence diagram for RLN Relay protocol (registration)
+msc {
+  hscale = "2";
+
+  d [label = " "], a [label = " "],b [label = " "];
+  a rbox a [label="Relay Node A"], 
+  b note b [label="Membership Contract"],
+  d rbox d [label = "Relay Node B"];
+ 
+ b abox b [ label=" \n Listening to the membership contract \n "] ;
+
+  a box a [ label=" \n Generate sk,pk \n "] ;
+  a=>b [ label = " \n Register(pk, x ETH) \n " ] ;
+ a box a [ label=" \n Listening to the membership contract \n "] ;
+
+  b box b [label=" \n Insert pk as a leaf to the tree \n \n index: The index of the inserted leaf \n \n root: The updated tree root \n \n authPath: The authentication path \n  "];
+  |||;
+  b=>a [ label = "index, root, authPath"];
+  |||;
+  ...,  ---;
+  ...   [ label = "Other relay nodes register and the membership tree gets updatetd" ];
+  ...,  ---;
+  a=>b [ label = "getRoot()" ] ;
+  b box b [label="  \n  root: Get the current root\n  "];
+  b=>a [ label = "root"];
+
+  ...,  ---  [ label = "    " ];
+
+  a=>b [ label = "getAuthPath(index)" ] ;
+  b box b [label="  \n  authPath: Calculate the authentication path of the leaf with the given index and based on the current tree\n  "];
+
+  b=>a [ label = "authPath"];
+}