Add README

README.md

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+# rr-dl
+
+_Royal Road Novel Downloader_
+
+## Usage
+
+```
+Usage: rr-dl [options] [ARGS]
+
+Description: A cli program for downloading novels from royalroad.com
+
+Options:
+  -a, --all                 Select all chapters
+  -t, --title               Add chapter title to start of file
+  -I, --indexing <int>      Index chapters starting from value
+  -i, --index               Prefix title with chapter index
+  -d, --directory <string>  Set download location
+  -h, --help                display this help and exit
+  --version                 output version information and exit
+```
+
+## Examples
+Search for novel
+```
+rr-dl
+```
+
+Search for novels titled "test"
+```
+rr-dl test
+```
+
+Search for novels titled "test" and select all chapters for download
+```
+rr-dl -a test
+```
+
+Search for novels titled "test" and prefix chapter titles with index + 10
+```
+rr-dl -I 10 test
+```