Add Raindrop.io extension

extensions/raindrop/.editorconfig

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+root = true
+
+[*]
+indent_size = 2
+indent_style = space
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

extensions/raindrop/.eslintrc.json

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+{
+  "root": true,
+  "env": {
+    "es2020": true,
+    "node": true
+  },
+  "parser": "@typescript-eslint/parser",
+  "plugins": ["@typescript-eslint"],
+  "extends": ["eslint:recommended", "plugin:@typescript-eslint/recommended", "prettier"]
+}

extensions/raindrop/.prettierrc

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+{
+  "printWidth": 100,
+  "singleQuote": false,
+  "tabWidth": 2
+}

extensions/raindrop/README.md

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+# Raindrop.io extension for Raycast
+
+## Instructions
+
+For this extension we need a test access token, for this you need to create an app in Raindrop's [settings](https://app.raindrop.io/settings/integrations).
+
+1. In the **For Developers** section click on **+ Create new app**.
+2. Set the app **name**, accept the Terms and Guidelines and click **Create**.
+3. Click in the newly created app.
+4. In the bottom of the form click on **Create test token**.
+5. Copy the created token.
+
+Install the extension and the first time you run any command it will ask you for your new token.