Document usage

README.md

@@ -1 +1,74 @@
 # Markdown table formatter in Golang
+
+## Import
+
+```sh
+ $ go get github.com/fbiville/markdown-table-formatter/pkg/markdown 
+```
+
+## Usage
+
+### Basic
+
+```go
+package some_package
+
+import (
+	"fmt"
+	"github.com/fbiville/markdown-table-formatter/pkg/markdown"
+)
+
+func someFunction() {
+	basicTable, err := markdown.NewTableFormatterBuilder().
+		Build("column 1", "column 2", "column 3").
+		Format([][]string{
+			{"so", "much", "fun"},
+			{"don't", "you", "agree"},
+		})
+	if err != nil {
+		// ... do your thing
+	}
+	fmt.Print(basicTable)
+}
+```
+
+The output will be:
+```
+| column 1 | column 2 | column 3 |
+| -------- | -------- | -------- |
+| so | much | fun |
+| don't | you | agree |
+```
+
+### Pretty-print
+
+```go
+package some_package
+
+import (
+	"fmt"
+	"github.com/fbiville/markdown-table-formatter/pkg/markdown"
+)
+
+func someFunction() {
+	prettyPrintedTable, err := markdown.NewTableFormatterBuilder().
+		WithPrettyPrint().
+		Build("column 1", "column 2", "column 3").
+		Format([][]string{
+			{"so", "much", "fun"},
+			{"don't", "you", "agree"},
+		})
+	if err != nil {
+		// ... do your thing
+	}
+	fmt.Println(prettyPrintedTable)
+}
+```
+
+The output will be:
+```
+| column 1 | column 2 | column 3 |
+| -------- | -------- | -------- |
+| so       | much     | fun      |
+| don't    | you      | agree    |
+```