Adding docs to readme.

Signed-off-by: Euan Torano <[email protected]>

Author: euantorano

README.md

@@ -18,6 +18,8 @@ Or add the following to your `.nimble` file:
 requires "pledge >= 1.1.0"
 ```
 
+## [Documentation](https://htmlpreview.github.io/?https://github.com/euantorano/pledge.nim/blob/master/docs/pledge.html)
+
 ## Usage
 
 ```nim

tests/main.nim

@@ -11,4 +11,4 @@ suite "pledge tests":
       pledge(Promise.Stdio)
 
       expect OSError:
-        pledge(Promise.Stdio, Promise.Rpath) == false
+        pledge(Promise.Stdio, Promise.Rpath)