Add Smartsheet

Business/Smartsheet.md

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+# [Smartsheet](https://smartsheet.redoc.ly/)
+
+## __Description__
+Allows you to programmatically access and Smartsheet data and account information
+
+## __Example Request__
+* Curl
+```
+curl 'https://api.smartsheet.com/2.0/home?include=source' -H "Authorization: Bearer {{token}}"
+```
+
+* Raw
+```
+GET /2.0/home?include=source HTTP/1.1
+Authorization: Bearer {{token}}
+Host: api.smartsheet.com
+```
+
+## __Response__
+* Success
+```
+{
+    "sheets":[],
+    "folders":[],
+    "workspaces":[]
+}
+```
+* Error
+```
+{
+  "errorCode" : 1002,
+  "message" : "Your Access Token is invalid.",
+  "refId" : "xxxxxxxxxxxx"
+}
+```
+
+## __Regex__
+```
+[a-z0-9]{26}
+```
+
+## __Example API key__
+```
+bb1aa18d0eeea0fc7ggg799h3i
+```