update readme.md (#26)

Update README.md

Author: SerenityIK

README.md

@@ -32,6 +32,20 @@ Plug 'amiralies/coc-elixir', {'do': 'yarn install && yarn prepack'}
 - Smart closing of code blocks
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+## Dialayzer integration
+Coc-elixir will automatically analyze your project with [Dialyzer](http://erlang.org/doc/apps/dialyzer/dialyzer_chapter.html) after each successful build. It maintains a "manifest" file in `.elixir_ls/dialyzer_manifest` that stores the results of the analysis.
+
+You can control which warnings are shown using the `elixirLS.dialyzerWarnOpts` setting in `coc-setting.json`, found at `~/config/nvim/coc-settings.json`, or use command `:CocConfig` to open configuration file.
+You can find available options in Erlang [docs](http://erlang.org/doc/man/dialyzer.html) at section "Warning options".
+
+To disable Dialyzer completely add setting:
+```json
+{
+  "elixirLS.dialyzerEnabled": false
+}
+```
+You can also set the module attribute @dialyzer to show or hide warnings at a module or function level.
+
 ## Troubleshooting
 
 ### Server fails to start