README added

README.md

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+# RDI
+A Fast Algorithm for Calculating a Novel Degradation Index from RNA-seq Data
+## Install RDI
+To install RDI, download the source file RDI_0.0.0.9000.tar.gz, then run
+```
+install.packages("RDI_0.0.0.9000.tar.gz",repo=NULL,type="source")
+```
+
+## Run RDI
+To run RDI, first create and index the reference transcriptome for calculating RDI
+```
+create_index(fasta_file, output_prefix) # fasta file is the reference transcriptome, for example GRCm38 for mouse
+```
+Then calculate RDI value for each sample
+```
+calculate_RDI(fq_file1, fq_file2, index_path, num_threads, output_dir)
+```