Add README.md

Author: msanroman

eslint/README.md

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+# @bufferapp/eslint-config
+
+This is the standard ESLint config files for the projects within the @bufferapp
+ GitHub organization.
+
+## Usage
+
+```console
+npm install --save-dev @bufferapp/eslint-config eslint
+# or
+yarn add -D @bufferapp/eslint-config eslint
+```
+
+NOTE: We will need to define custom installation instructions for front-end
+ and backend-based configs, depending on those we will have different
+  `peerDependencies` for the ESLint configs.
+
+And then, on your `.eslintrc` use
+
+```
+"extends": "@bufferapp/eslint-config-backend"
+#or
+"extends": "@bufferapp/eslint-config-frontend"
+```