diff --git a/README.md b/README.md
index c655c644..0fec5a36 100644
--- a/README.md
+++ b/README.md
@@ -1,32 +1,41 @@
-# ameba
+<p align="center">
+  <img src="https://media.githubusercontent.com/media/veelenga/bin/master/ameba/logo.png" width="200">
+  <h3 align="center">Ameba</h3>
+  <p align="center">Code style linter for Crystal<p>
+  <p align="center">
+    <sup>
+      <i>
+        (a single-celled animal that catches food and moves about by extending fingerlike projections of protoplasm)
+      </i>
+    </sup>
+  </p>
+</p>
 
-TODO: Write a description here
+## Status
+
+**CONSTRUCTION ZONE** :construction:
 
 ## Installation
 
 Add this to your application's `shard.yml`:
 
 ```yaml
-dependencies:
+development_dependencies:
   ameba:
-    github: [your-github-name]/ameba
+    github: veelenga/ameba
 ```
 
 ## Usage
 
 ```crystal
 require "ameba"
+
+Ameba.run
 ```
 
-TODO: Write usage instructions here
-
-## Development
-
-TODO: Write development instructions here
-
 ## Contributing
 
-1. Fork it ( https://github.com/[your-github-name]/ameba/fork )
+1. Fork it ( https://github.com/veelenga/ameba/fork )
 2. Create your feature branch (git checkout -b my-new-feature)
 3. Commit your changes (git commit -am 'Add some feature')
 4. Push to the branch (git push origin my-new-feature)
@@ -34,4 +43,4 @@ TODO: Write development instructions here
 
 ## Contributors
 
-- [[your-github-name]](https://github.com/[your-github-name]) Vitalii Elenhaupt - creator, maintainer
+- [veelenga](https://github.com/veelenga) Vitalii Elenhaupt - creator, maintainer
diff --git a/src/ameba.cr b/src/ameba.cr
index 11c92400..3a5bc6b2 100644
--- a/src/ameba.cr
+++ b/src/ameba.cr
@@ -1,5 +1,26 @@
 require "./ameba/*"
+require "./ameba/rule/*"
 
 module Ameba
-  # TODO Put your code here
+  extend self
+
+  RULES = [
+    Rule::LineLength,
+  ]
+
+  def run
+    run Dir["**/*.cr"]
+  end
+
+  def run(files)
+    files.each do |path|
+      catch Source.new(File.read path)
+    end
+  end
+
+  def catch(source : Source)
+    RULES.each do |rule|
+      rule.new.test(source)
+    end
+  end
 end
diff --git a/src/ameba/rule/line_length.cr b/src/ameba/rule/line_length.cr
new file mode 100644
index 00000000..0b54dac9
--- /dev/null
+++ b/src/ameba/rule/line_length.cr
@@ -0,0 +1,9 @@
+struct Ameba::Rule::LineLength
+  def test(source)
+    source.lines.each do |line|
+      if line.size > 79
+        source.errors << "Line too long"
+      end
+    end
+  end
+end
diff --git a/src/ameba/source.cr b/src/ameba/source.cr
new file mode 100644
index 00000000..e2f0f08c
--- /dev/null
+++ b/src/ameba/source.cr
@@ -0,0 +1,10 @@
+module Ameba
+  class Source
+    getter lines : Array(String)
+    getter errors = [] of String
+
+    def initialize(content : String)
+      @lines = content.split "\n"
+    end
+  end
+end