Update README

playground/README.md

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+A sample go project with minium config for go.nvim
+
+Start with (may need to restart nvim after the first time)
+
+```shell
+cd sampleApp
+nvim -u ../init.lua main.go
+
+```
+
+To start debugging, run the following commands
+```vim
+:10
+:GoBreakToggle
+:GoDebug
+```
+
+To unit test, run the following commands
+```vim
+:pkg/findAllSubStr_test.go
+:10
+:GoTestFunc
+```