contrib: add a few I2P seed nodes

Author: jonatack

contrib/seeds/nodes_main.txt

@@ -1188,3 +1188,13 @@ sys54sv4xv3hn3sdiv3oadmzqpgyhd4u4xphv4xqk64ckvaxzm57a7yd.onion:8333
 tddeij4qigtjr6jfnrmq6btnirmq5msgwcsdpcdjr7atftm7cxlqztid.onion:8333
 vi5bnbxkleeqi6hfccjochnn65lcxlfqs4uwgmhudph554zibiusqnad.onion:8333
 xqt25cobm5zqucac3634zfght72he6u3eagfyej5ellbhcdgos7t2had.onion:8333
+
+# manually added 2021-05 for minimal i2p bootstrap support
+72l3ucjkuscrbiiepoehuwqgknyzgo7zuix5ty4puwrkyhtmnsga.b32.i2p:8333
+c4gfnttsuwqomiygupdqqqyy5y5emnk5c73hrfvatri67prd7vyq.b32.i2p:8333
+gehtac45oaghz54ypyopim64mql7oad2bqclla74l6tfeolzmodq.b32.i2p:8333
+h3r6bkn46qxftwja53pxiykntegfyfjqtnzbm6iv6r5mungmqgmq.b32.i2p:8333
+hnbbyjpxx54623l555sta7pocy3se4sdgmuebi5k6reesz5rjp6q.b32.i2p:8333
+pjs7or2ctvteeo5tu4bwyrtydeuhqhvdprtujn4daxr75jpebjxa.b32.i2p:8333
+wwbw7nqr3ahkqv62cuqfwgtneekvvpnuc4i4f6yo7tpoqjswvcwa.b32.i2p:8333
+zsxwyo6qcn3chqzwxnseusqgsnuw3maqnztkiypyfxtya4snkoka.b32.i2p:8333