docs/tutorials: draft gpu/stratum mining doc

docs/tutorials/mining.md

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+# GPU Mining with Core-Geth
+
+
+
+```sh
+./build/bin/geth version
+CoreGeth
+Version: 1.12.9-unstable
+Git Commit: 5bcbb9dae506d82d1cb7af9d53c66986501d0f57
+Git Commit Date: 20220801
+Architecture: amd64
+Go Version: go1.18.3
+Operating System: linux
+GOPATH=/home/ia/go
+GOROOT=/home/ia/go1.18.3.linux-amd64
+
+./build/bin/geth \
+    --mordor \
+    --datadir ~/SAMSUNG_T5_3/chaindata/mordor \
+    --ipcpath /tmp/geth.ipc  \
+    --http \
+    --mine \
+    --miner.etherbase 0x31C488d65472a8c0345e5bBd928730a54d29bF37 \
+    --miner.notify http://localhost:8888
+```
+
+- https://github.com/cyberpoolorg/etc-stratum
+- [etc-stratum_config_mordor_ia.json ](https://gist.github.com/meowsbits/f1a28a8b11534c0a2536af871796bc5a)
+```sh
+./build/bin/etc-stratum etc-stratum_config_mordor_ia.json 
+```
+
+
+- https://trex-miner.com/ T-Rex worked on Mordor, while GMiner and lolMiner both got the epoch wrong (eg. 230 instead of 115). Having the wrong epoch caused them to produce invalid shares and blocks. This issue was only with Mordor; I've used both GMiner and lolMiner to mine ETC mainnet successfully.
+
+```sh
+./t-rex-0.26.4-linux/t-rex \
+    -i 9 \
+    -a etchash \
+    -o stratum+tcp://0.0.0.0:8008 \
+    -u 0x31c488d65472a8c0345e5bbd928730a54d29bf37 \
+    -p x \
+    -w rig0
+```