add doc

Author: wangqinhu

Diff for: LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2017 Qinhu Wang, Northwest A&F University
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

Diff for: README.md

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+ID operation tool (idot)
+------------------------
+
+idot
+----
+```
+idot <command> [<arguments>]
+
+Command:  find     find id_file matched lines in target_file
+          diff     find specific lines in id_file or target_file
+          replace  replace id in the target_file according to the id_file
+          fasta    fetch id_file match fasta sequences from all sequences
+```
+
+
+idot find
+---------
+```
+idot find [options] <id_file> <target_file>
+
+Options:  -d  STR  The delimiter character of fields, default <TAB>.
+                   Valid delimiters: comma (","), space ("\s"), or <TAB> ("\t")
+          -f  INT  The field(s) that specified as ID column(s), default 1.
+                   Use comma (",") to specify multiple fields. e.g. -f 1,2
+          -s  STR  The method used for ID sort.  default: u.
+                   Available methods: sn - strint number
+                                      s  - string
+                                      n  - number
+                                      u  - unsorted (use id_file id order)
+                                      t  - use target_file id order
+                                      r  - reverse (in combination with others)
+          -h       Help message
+```
+
+idot diff
+---------
+```
+idot diff [options] <id_file> <target_file>
+
+Options:  -d  STR  The delimiter character of fields, default <TAB>.
+                   Valid delimiters: comma (","), space ("\s"), or <TAB> ("\t")
+          -f  INT  The field(s) that specified as ID column(s), default 1.
+                   Use comma (",") to specify multiple fields. e.g. -f 1,2
+          -p  INT  Print the specific ID of file: 1 - id_file (default)
+                                                  2 - target_file
+          -h       Help message
+```
+
+idot replace
+------------
+```
+idot replace <id_file> <target_file>
+```
+
+idot fasta
+----------
+```
+Usage:    idot fasta <id_file> <database_file>
+```
+
+Author
+------
+Qinhu Wang ([email protected])
+
+Copyright
+---------
+2017 (c) Qinhu Wang, Northwest A&F University
+
+License
+-------
+MIT