Added GhostRider release notes

src/crypto/ghostrider/README.md

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+# GhostRider (Raptoreum) release notes
+
+**XMRig** supports GhostRider algorithm starting from version **v6.16.0**.
+
+No tuning is required - auto-config works well on most CPUs!
+
+**Note for Windows users: MSVC binary is ~5% faster than GCC binary!**
+
+### Sample command line (non-SSL port)
+```
+xmrig -a gr -o raptoreumemporium.com:3008 -u WALLET_ADDRESS
+```
+
+### Sample command line (SSL port)
+```
+xmrig -a gr -o us.flockpool.com:5555 --tls -u WALLET_ADDRESS
+```
+
+You can use **rtm_ghostrider_example.cmd** as a template and put pool URL and your wallet address there. The general XMRig documentation is available [here](https://xmrig.com/docs/miner).
+
+## Performance
+
+While individual algorithm implementations are a bit unoptimized, XMRig achieves higher hashrates by employing better auto-config and more fine-grained thread scheduling: it can calculate a single batch of hashes using 2 threads for parts that don't require much cache. For example, on a typical Intel CPU (2 MB cache per core) it will use 1 thread per core for cn/fast, and 2 threads per core for other Cryptonight variants while calculating the same batch of hashes, always achieving more than 50% CPU load.
+
+For the same reason, XMRig can sometimes use less than 100% CPU on Ryzen 3000/5000 CPUs if it finds that running 1 thread per core is faster for some Cryptonight variants on your system. Also, this is why it reports using only half the threads at startup - it's actually 2 threads per each reported thread.
+
+**Windows** (detailed results [here](https://imgur.com/a/GCjEWpl))
+CPU|cpuminer-gr-avx2 (tuned), h/s|XMRig (MSVC build), h/s|Speedup
+-|-|-|-
+AMD Ryzen 7 4700U|632.6|731|+15.5%
+Intel Core i7-2600|496.4|533.6|+7.5%
+AMD Ryzen 7 3700X @ 4.1 GHz|2453.0|2469.1|+0.65%
+AMD Ryzen 5 5600X @ 4.65 GHz|2112.6|2221.2|+5.1%
+
+**Linux** (tested by **Delgon**, detailed results [here](https://cdn.discordapp.com/attachments/604375870236524574/913167614749048872/unknown.png))
+CPU|cpuminer-gr-avx2 (tuned), h/s|XMRig (GCC build), h/s|Speedup
+-|-|-|-
+AMD Ryzen 9 3900X|3746.51|3604.89|-3.78%
+2xIntel Xeon E5-2698v3|2563.4|2638.38|+2.925%