[add] readme

README.md

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+
+# hosts2blocker
+
+Converts a hosts file into a list of domains.
+
+```
+Usage: hosts2blocker [OPTIONS]
+
+Options:
+  -i, --input-file <INPUT_FILE>    [default: input.txt]
+  -o, --output-file <OUTPUT_FILE>  [default: output.txt]
+  -h, --help                       Print help
+  -V, --version                    Print version
+```
+
+#### Example
+
+Input: 
+```hosts
+0.0.0.0 google.com
+0.0.0.0 github.com
+```
+
+Output:
+```
+google.com
+github.com
+```
+