Added doc/ALGORITHMS.md.

doc/ALGORITHMS.md

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+# Algorithms
+
+XMRig uses a different way to specify algorithms, compared to other miners.
+
+Algorithm selection splitted to 2 parts:
+
+ * Global base algorithm per miner or proxy instance, `algo` option. Possible values: `cryptonight`, `cryptonight-lite`, `cryptonight-heavy`.
+ * Algorithm variant specified separately for each pool, `variant` option.
+
+Possible variants for `cryptonight`:
+
+ * `0` Original cryptonight.
+ * `1` cryptonight variant 1, also known as cryptonight v7 or monero7.
+ * `"xtl"` Stellite coin variant.
+
+Possible variants for `cryptonight-lite`:
+
+ * `0` Original cryptonight-lite.
+ * `1` cryptonight-lite variant 1, also known as cryptonight-lite v7 or aeon7.
+ * `"ipbc"` IPBC coin variant.
+
+For `cryptonight-heavy` currently no variants.
+
+
+### Cheatsheet
+
+You mine **Sumokoin** or **Haven Protocol**?
+Your algorithm is `cryptonight-heavy` no variant option need.
+
+You mine **Aeon**, **TurtleCoin** or **IPBC**?.
+Your base algorithm is `cryptonight-lite`:
+Variants:
+ * Aeon: `-1` autodetect. `0` right now, `1` after fork.
+ * TurtleCoin: `1`.
+ * IPBC: `"ipbc"`.
+
+In all other cases base algorithm is `cryptonight`.
+
+### Mining algorithm negotiation
+If your pool support [mining algorithm negotiation](https://github.com/xmrig/xmrig-proxy/issues/168) miner will choice proper variant automaticaly and if you choice wrong base algorithm you will see error message.
+
+Pools with mining algorithm negotiation support.
+ * [www.hashvault.pro](https://www.hashvault.pro/)