Update Readme

README.md

@@ -1,9 +1,39 @@
 # Dust
 du + rust = dust. A rust alternative to du
 
-unlike du, dust is meant to give you an instant overview of which directories are using disk space.
+Unlike du, dust is meant to give you an instant overview of which directories are using disk space without requiring sort or head. Dust does not count file system blocks; it uses file sizes instead. Dust will print a maximum of 1 'Did not have permissions message'.
+
+
+Dust will list the 15 biggest sub directories and will smartly recurse down the tree to find the larger ones. There is no need for a '-d' flag or a '-h' flag. The largest sub directory will have its size shown in red
+
+```
+Usage: dust <dir>
+Usage: dust -n 30  <dir>  (Shows 30 directories not 15)
+```
+
+
+```
+dust .
+ 161M  .
+ 160M └── ./target
+ 123M    ├── ./target/debug
+  83M    │  ├── ./target/debug/deps
+  16M    │  │  ├── ./target/debug/deps/libclap-82e6176feef5d4b7.rlib
+ 8.6M    │  │  └── ./target/debug/deps/dust-993f7d919d92f0f8.dSYM
+ 8.6M    │  │     └── ./target/debug/deps/dust-993f7d919d92f0f8.dSYM/Contents
+ 8.6M    │  │        └── ./target/debug/deps/dust-993f7d919d92f0f8.dSYM/Contents/Resources
+  27M    │  ├── ./target/debug/incremental
+  12M    │  └── ./target/debug/build
+  20M    ├── ./target/x86_64-apple-darwin
+  20M    │  └── ./target/x86_64-apple-darwin/debug
+  20M    │     └── ./target/x86_64-apple-darwin/debug/deps
+  16M    │        └── ./target/x86_64-apple-darwin/debug/deps/libclap-7e3f8513c52cd558.rlib
+  16M    └── ./target/release
+  13M       └── ./target/release/deps
+```
+
+Performance: dust is currently about 4 times slower than du.
+
 
-du is good when combined with sort and head. Dust is an all in one command.
 
-do not use. strickly experimental for me messing around with rust.