Update README

README.md

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+![Built with love](http://forthebadge.com/images/badges/built-with-love.svg)
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 # stanford-dl
-A dead simple script to download videos or pdfs from Stanford Engineering Everywhere. 
+
+A simple multithreaded video/pdf downloader from ***Stanford Engineering Everywhere*** that *just works*.  
+
+> NOTE : This tool is to be used strictly for educational purposes.
+
+#### Installation
+###### Build from source
+
+```go
+go get github.com/coderick14/stanford-dl
+```
+###### Download compiled binaries
+Just download the binary for your required OS and Architecture from [releases](https://github.com/coderick14/stanford-dl/releases).
+
+#### Usage
+Type `stanford-dl --help` to get usage details. 
+```
+stanford-dl -course COURSE_CODE [-type {video|pdf}] [-all] [-lec lectures] [--help]
+
+--course    Course name e.g. CS229, EE261
+--type 	    Specify whether to download videos or pdfs. Defaults to PDF.
+--all       Download for all lectures
+--lec       Comma separated list of lectures e.g. 1,3,5,10
+--help      Display this help message and quit
+```
+
+#### Examples
+- Get all transcripts (PDFs) for a course
+```
+stanford-dl -course CS229 -type pdf -all
+```
+- Get only certain lectures
+```
+stanford-dl -course CS229 -type pdf -lec 1,3,5,10
+```
+- Get all videos for a course
+```
+stanford-dl -course CS229 -type video -all
+```
+- Get only certain lectures
+```
+stanford-dl -course CS229 -type video -lec 1,3,5,10
+```
+
+#### Contributions
+This script has minimum functionality now. PLease feel free to contribute for adding more features :)