Added README.md and architecture docs for --editor (#288)

Author: Josh Goldberg

README.md

@@ -39,6 +39,7 @@ TSLint rules without ESLint equivalents will be wrapped with [eslint-plugin-tsli
 Each of these flags is optional:
 
 -   **[`config`](#config)**: Path to print the generated ESLint configuration file to.
+-   **[`editor`](#editor)**: Path to an editor configuration file to convert linter settings within.
 -   **[`eslint`](#eslint)**: Path to an ESLint configuration file to read settings from.
 -   **[`package`](#package)**: Path to a package.json file to read dependencies from.
 -   **[`tslint`](#tslint)**: Path to a TSLint configuration file to read settings from.
@@ -59,6 +60,17 @@ The file extension of this path will be used to determine the format of the crea
 -   `.js` file paths will be written `module.exports = ...` JavaScript
 -   Other file paths will default to JSON
 
+#### `editor`
+
+```shell
+npx tslint-to-eslint-config --editor ./path/to/.vscode/settings.json
+```
+
+_Default: `.vscode/settings.json`_
+
+Path to an editor configuration file to convert settings settings within.
+Any VS Code style editor settings for TSLint will be converted to their ESLint equivalents.
+
 #### `eslint`
 
 ```shell

docs/Architecture.md

@@ -4,9 +4,10 @@
 
 1.  CLI usage starts in `bin/tslint-to-eslint-config`, which immediately calls `src/cli/main.ts`.
 2.  CLI settings are parsed and read in `src/cli/runCli.ts`.
-3.  Application logic is run by `src/conversion/convertConfig.ts`.
+3.  Linter configuration conversion is run by `src/conversion/convertConfig.ts`.
+4.  Editor configuration conversion is run by `src/conversion/convertEditorConfig.ts`.
 
-## Configuration Conversion
+## Linter Configuration Conversion
 
 Within `src/conversion/convertConfig.ts`, the following steps occur:
 
@@ -46,3 +47,8 @@ It's possible that one ESLint rule will be output by multiple converters.
 These are located in `src/rules/mergers/`, and keyed under their names by the map in `src/rules/mergers.ts`.
 
 For example, `@typescript-eslint/ban-types` spreads both arguments' `types` members into one large `types` object.
+
+## Editor Configuration Conversion
+
+Editor lint configurations are converted by `src/editorSettings/convertEditorSettings.ts`.
+Any setting that matches a known built-in TSLint setting will be replaced with the ESLint equivalent.