webstorm: add page (#7727)

pages/common/webstorm.md

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+# webstorm
+
+> The JetBrains JavaScript IDE.
+> More information: <https://www.jetbrains.com/help/webstorm/working-with-the-ide-features-from-command-line.html>.
+
+- Open the current directory in WebStorm:
+
+`webstorm`
+
+- Open a specific directory in WebStorm:
+
+`webstorm {{path/to/directory}}`
+
+- Open specific files in the LightEdit mode:
+
+`webstorm -e {{path/to/file1 path/to/file2 ...}}`
+
+- Open and wait until done editing a specific file in the LightEdit mode:
+
+`webstorm --wait -e {{path/to/file}}`
+
+- Open a file with the cursor at the specific line:
+
+`webstorm --line {{line_number}} {{path/to/file}}`
+
+- Open and compare files (supports up to 3 files):
+
+`webstorm diff {{path/to/file1}} {{path/to/file2}}`
+
+- Open and perform a three-way merge:
+
+`webstorm merge {{path/to/left_file}} {{path/to/right_file}} {{path/to/target_file}}`