add: spellcheck utility implementation using ispell

README.md

@@ -1,3 +1,19 @@
 # sp
 
-Spellchecking utility to provide automatic corrected spelling for the provided input using gnu/linux spell.
+Spellchecking utility to provide automatic corrected spelling for the provided input using GNU/linux ispell.
+
+## Installation
+
+Build the tool using the following command:
+
+```bash
+zig build -Doptimize=ReleaseFast
+```
+
+This was build using zig 0.12.0.dev but should work with the most recent version of zig.
+
+Add the build `sp` executable in your `PATH` environment to easily invoke the tool.
+
+## Usage
+
+`sp <word>` to check the provided _word_. Returns the correct spelling of the word. In case of a misspelling the first suggestion of ispell is automatically choosen and returned.