Implement recursive watching of a directory

Package.resolved

@@ -1,5 +1,5 @@
 {
-  "originHash" : "db0ba74c125e968c67646390cbba012a5572a5c9c54171588ecbb73e370a448d",
+  "originHash" : "fd1e824e418c767633bb79b055a4e84d9c86165746bc881d5d27457ad34b0c20",
   "pins" : [
     {
       "identity" : "noora",
@@ -46,6 +46,15 @@
         "version" : "1.1.3"
       }
     },
+    {
+      "identity" : "swift-atomics",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-atomics.git",
+      "state" : {
+        "revision" : "b601256eab081c0f92f059e12818ac1d4f178ff7",
+        "version" : "1.3.0"
+      }
+    },
     {
       "identity" : "swift-collections",
       "kind" : "remoteSourceControl",
@@ -64,6 +73,15 @@
         "version" : "1.10.1"
       }
     },
+    {
+      "identity" : "swift-nio",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-nio",
+      "state" : {
+        "revision" : "e932d3c4d8f77433c8f7093b5ebcbf91463948a0",
+        "version" : "2.95.0"
+      }
+    },
     {
       "identity" : "swift-subprocess",
       "kind" : "remoteSourceControl",