add readme

readme.md

+# Filter .fasta file by accession Number
+
+Filter .fasta file by accession Number
+----
+
+Program to get the fasta files from a list of accession numbers
+
+save a *.fasta file in the same directory as the this script
+also save a *.txt file, with the accesion numbers, in the same directory
+
+the file should look like this...
+
+P15105
+P00186
+Q91X77
+
+then to run the program
+python main 
+
+good luck!
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