Create browser-sync.md (#1287)

pages/common/browser-sync.md

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+# browser-sync
+
+> Starts local web server that updates browser on file changes.
+
+- Start a server from a specific directory:
+
+`browser-sync start --server {{path/to/directory}} --files {{path/to/directory}}`
+
+- Start a server from local directory, watching all css files in some directory:
+
+`browser-sync start --server --files '{{path/to/directory/*.css}}'`
+
+- Create configuration file:
+
+`browser-sync init`
+
+- Start browser-sync from config file:
+
+`browser-sync start --config {{config_file}}`