Add Rxjs binding example

Author: nojaf

analysis/tests/src/RxjsCompletion.res

@@ -23,6 +23,8 @@ let main = async () => {
 
     // merge(keydown, keyup).
     //                       ^com
+
+	// Rxjs.Observable.subscribe, Rxjs.pipe and Rxjs.pipe2 should be completed
   }
 
   ignore(keyMapObservable)

analysis/tests/src/expected/RxjsCompletion.res.txt

@@ -1,11 +1,11 @@
 Complete src/RxjsCompletion.res 23:29
-posCursor:[23:29] posNoWhite:[23:28] Found expr:[7:17->28:1]
-posCursor:[23:29] posNoWhite:[23:28] Found expr:[8:2->27:26]
+posCursor:[23:29] posNoWhite:[23:28] Found expr:[7:17->30:1]
+posCursor:[23:29] posNoWhite:[23:28] Found expr:[8:2->29:26]
 posCursor:[23:29] posNoWhite:[23:28] Found expr:[9:4->23:29]
 posCursor:[23:29] posNoWhite:[23:28] Found expr:[11:4->23:29]
 posCursor:[23:29] posNoWhite:[23:28] Found expr:[17:4->23:29]
 posCursor:[23:29] posNoWhite:[23:28] Found expr:[23:7->23:29]
-Pexp_field [23:7->23:28] _:[25:2->23:29]
+Pexp_field [23:7->23:28] _:[27:2->23:29]
 Completable: Cpath Value[merge](Nolabel, Nolabel).""
 Raw opens: 1 Rxjs.place holder
 Package opens Pervasives.JsxModules.place holder
@@ -16,5 +16,16 @@ ContextPath Value[merge]
 Path merge
 CPPipe pathFromEnv:Observable found:true
 Path Rxjs.Observable.
-[]
+[{
+    "label": "->Observable.subscribe",
+    "kind": 12,
+    "tags": [],
+    "detail": "(t<'t>, 't => unit) => subscription",
+    "documentation": null,
+    "sortText": "subscribe",
+    "textEdit": {
+    "range": {"start": {"line": 23, "character": 28}, "end": {"line": 23, "character": 28}},
+    "newText": "->Observable.subscribe"
+  }
+  }]