update readme

README.md

@@ -1,2 +1,27 @@
-# go-codepoint-converter
+# go-utf8-codepoint-converter
+
 Converts strings of UTF-8 codepoint representation to the UTF-8 encoding
+
+## Usage
+
+This library takes a literal codepoint string and calculates the UTF-8 encoding of it. Example:
+
+```go
+package main
+
+import "github.com/RageCage64/go-utf8-codepoint-converter/codepoint"
+
+func main() {
+    codepointStr := "U+1F60A"
+    utf8bytes, _ := codepoint.Convert(codepointStr)
+    fmt.Println(string(utf8bytes))
+    codepointStr := "\\U0001F603"
+    utf8bytes, _ = codepoint.Convert(codepointStr)
+    fmt.Println(string(utf8bytes))
+}
+```
+Result:
+```
+😊
+😃
+```