Update README.md

Read the readme please.

README.md

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 # keyhunt
 privkey hunt for crypto currencies that use secp256k1  elliptic curve
+
+Work for btc in this moment, only legacy Addresses that start with '1'
+
+Ethereum addresses is a work in develop
+
+# How to use
+First compile:
+
+``make``
+
+and then execute:
+
+``./keyhunt``
+
+you need to have tome file called **adddress.txt** or specify other file with the **-f** opcion
+
+``./keyhunt -f ~/some/path/to/other/file.txt``
+
+if you want more thereads use the **-t** option
+
+``./keyhunt -f ~/some/path/to/other/file.txt -t 8``
+
+if you want to know the full help just use **-h** param
+
+``./keyhunt -h``
+
+al the hunted keys are saved in a file keys.txt
+
+The default behaivor ot keyhunt is to choose a random key and check secuentialy for the next 4.2 billions keys, this is **4294967295** or **0xffffffff**
+
+# Dependencies
+- libgmp
+- pthread
+
+Tested under Debian