add attach.md

Author: riccardobl

wallets/bolt12/ATTACH.md

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+
+# wait for channels to be ready
+
+You'll need to wait for eclair to have at least one channel in NORMAL state
+
+`sndev cli eclair channels`
+
+
+# get bolt12 offer
+
+`sndev cli eclair tipjarshowoffer`
+
+# check channels balance
+
+`sndev cli eclair usablebalances`