Merge branch 'master' of https://github.com/vshymanskyy/TinyGSM

README.md

@@ -47,11 +47,14 @@ Decoding 7,8,16-bit response | ✔      | ✔      | ✔         | ✔    |
 **SMS**
 Sending                      | ✔      | ✔      | ✔         | ✔    | 
 Sending Unicode              | ✔      | ✔      | ◌         | 🅧   | 
-Receiving/Reading            |        |        |           |      | 
+Reading                      |        |        |           |      | 
+Incoming message event       |        |        |           | ?    | 
 **Calls**
 Dial, hangup                 | ✔      | ✔      | ✔         | 🅧   | 
-Receiving calls              | ◌      | ◌      | ◌         | 🅧   | 
+Receiving calls              | ✔      | ✔      | ✔         | 🅧   | 
-DTMF decoding                |        |        | 🅧        | 🅧   | 
+Incoming event (RING)        | ◌      | ◌      | ◌         | 🅧   | 
+DTMF sending                 | ◌      | ◌      | ◌         | 🅧   | 
+DTMF decoding                | ◌      | ◌      | 🅧        | 🅧   | 
 **Location**
 GSM location service         | ✔      | ✔      | 🅧        | 🅧   | 
 GPS/GNSS                     | 🅧     | ✔²     | ◌¹        | 🅧   | 
@@ -84,6 +87,19 @@ More modems may be supported later:
 
 Watch this repo for new updates! And of course, contributions are welcome ;)
 
+## Donation
+
+[![Donate BountySource](https://img.shields.io/badge/Donate-BountySource-149E5E.svg)](https://salt.bountysource.com/checkout/amount?team=tinygsm-dev)
+[![Donate Bitcoin](https://img.shields.io/badge/Donate-Bitcoin-orange.svg)](http://tny.im/aen)
+
+If you have found TinyGSM to be useful in your work, research or company, please consider making a donation to the project commensurate with your resources. Any amount helps!  
+**All donations will be used strictly to fund the development of TinyGSM:**
+- Covering cellular network expences
+- Buying new hardware and modems for integration
+- Bounty Budget (to reward other developers for their contributions)
+- Implementing new features
+- Quality Assurance
+
 ## Getting Started
 
   1. Using your phone: