README.md: nix-build: add Run the result

Anton-Latukha · Anton-Latukha · commit 78ead0428f20 · 2020-09-30T18:25:39.000+03:00
diff --git a/README.md b/README.md
@@ -184,6 +184,13 @@ nix-build \
   --arg enableDWARFDebugging true
 ```
 
+#### Run the result
+
+```
+./result/bin/hnix
+```
+
+
 ## Using the HNix REPL
 
 To enter in:
