Rename readme

bitcoind-signet.md

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+# Bitcoin Signet Docker Image
+## ENV Variables
+
+* `BLOCKPRODUCTIONDELAY` - default sleep period between mining blocks (**mining mode only**)
+  * if ~/.bitcoin/BLOCKPRODUCTIONDELAY.txt is present will use this value, allowing the delay to be dynamically changed.
+* `MINERENABLED` - flag for enabling mining chain
+* `NBITS` - sets min difficulty in mining (**mining mode only**)
+* `PRIVKEY` - private key of signet signer (**mining mode only**)
+  * if `MINERENABLED=1` and not provided will generate this
+* `MINETO` - mine to a static address, if not provided will make new address for each block (**mining mode only**)
+* `SIGNETCHALLENGE` - sets the valid block producer for this signet
+  * if `MINERENABLED=1` and not provided will generate this, if provded PRIVKEY also must be populated
+  * Requied for client-mode
+  * 
+* `RPCUSER` - bitcoind RPC User
+* `RPCPASSWORD` - bitcoind RPC password
+* 
+* `ONIONPROXY` - tor SOCK5 endpoint
+* `TORPASSWORD` - tor control port password
+* `TORCONTROL` - tor control port endpoint
+* `I2PSAM` - I2P control endpoint
+* `UACOMMENT` - UA Comment which would show on bitcoin-cli -netinfo printout
+* 
+* `ZMQPUBRAWBLOCK` - bitcoind setting
+* `ZMQPUBRAWTX` - bitcoind setting
+* `ZMQPUBHASHBLOCK` - bitcoind setting
+* 
+* `RPCBIND` - bitcoind setting
+* `RPCALLOWIP` - bitcoind setting
+* `WHITELIST` - bitcoind setting
+* `ADDNODE` - add seeding node location, comma-separate for multiple nodes  (needed for client-mode)
+* `EXTERNAL_IP` - add public IP/onion endpoint information, comma-seperated for multiple IPs.
+