add: README

README.md

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+
+- Author: Guoyi Zhang
+
+- License: GPLv2
+
+## gene_marker
+
+Generate fasta file which `m` means selected position by Gblocks from Gblocks html report file.
+
+Usage:
+
+```
+gene_marker <input_file> <output_file>
+```
+
+## trim_marker
+
+Trim the multi-sequence-alignment based on the marker which `m` indicates selected position.
+
+Usage:
+
+```
+trim_marker <marker_fasta_file> <input_fasta_file> <output_file>
+```