Update list of supported functions

README.md

@@ -45,3 +45,32 @@ func main()  {
     c.WaitAllDone()
 }
 ```
+
+### List of supported functions
+
+```go
+package main
+
+import "goccm"
+
+func main() {
+    // Create the concurrency manager
+    // The first argument is the maximum number of goroutines to run concurrently.
+    c := goccm.New(10)
+
+    // Wait until a slot is available for the new goroutine.
+    c.Wait()
+
+    // Mark a goroutine as finished
+    c.Done()
+
+    // Wait for all goroutines are done
+    c.WaitAllDone()
+
+    // Close the manager manually
+    c.Close()
+
+    // Returns the number of goroutines which are running
+    c.RunningCount()
+}
+```