Feat 3960 kotlin send message function

kotlin/sendMessage/README.md

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+# SendMessage()
+
+A Kotlin Cloud Function for sending a message using a specific channel to a receiver
+
+Supported channels are `SMS`, `Email` , `Disocrd`, and `Twitter`.
+
+_SMS Example payload_
+
+```json
+{ 
+    "type": "SMS", 
+    "receiver": "+123456789", 
+    "message": "Programming is fun!" 
+}
+```
+
+_Email Example payload_
+
+```json
+{
+    "type": "Email",
+    "receiver": "[email protected]",
+    "message": "Programming is fun!",
+    "subject": "Programming is funny!"
+}
+```
+
+_Discord Example payload_
+
+```json
+
+{
+    "type": "Discord",
+    "message": "Hi"
+}
+```
+
+_Twitter Example payload_
+
+```json
+{
+    "type": "Twitter",
+    "message": "Programming is fun!"
+}
+```
+
+_Successful function response:_
+
+```json
+{   
+    "success": true 
+}
+```
+
+_Error function response:_
+
+```json
+{
+    "success": false,
+    "message": "Failed to send message,check webhook URL"
+}
+```
+
+## 📝 Variables
+
+List of variables used by this cloud function:
+
+Mailgun
+
+-  **MAILGUN_API_KEY** - API Key for Mailgun
+-  **MAILGUN_DOMAIN** - Domain Name from Mailgun
+
+Discord
+
+-  **DISCORD_WEBHOOK_URL** - Webhook URL for Discord
+
+Twilio
+
+-  **TWILIO_ACCOUNT_SID** - Acount SID from Twilio
+-  **TWILIO_AUTH_TOKEN** - Auth Token from Twilio
+-  **TWILIO_SENDER** - Sender Phone Number from Twilio
+
+Twitter
+-  **TWITTER_API_KEY** - API Key for Twitter
+-  **TWITTER_API_KEY_SECRET** - API Key Secret for Twitter
+-  **TWITTER_ACCESS_TOKEN** - Access Token from Twitter
+-  **TWITTER_ACCESS_TOKEN_SECRET** - Access Token Secret from Twitter
+
+## 🚀 Deployment
+
+1. Clone this repository, and enter this function folder:
+
+```
+$ git clone https://github.com/open-runtimes/examples.git && cd examples
+$ cd kotlin/sendMessage
+```
+
+2. Enter this function folder and build the code:
+
+```bash
+docker run -e INTERNAL_RUNTIME_ENTRYPOINT=src/Index.kt --rm --interactive --tty --volume $PWD:/usr/code openruntimes/kotlin:v2-1.6 sh /usr/local/src/build.sh
+```
+
+As a result, a `code.tar.gz` file will be generated.
+
+3. Spin-up open-runtime:
+
+```bash
+docker run -p 3000:3000 -e INTERNAL_RUNTIME_KEY=secret-key --rm --interactive --tty --volume $PWD/code.tar.gz:/tmp/code.tar.gz:ro openruntimes/kotlin:v2-1.6 sh /usr/local/src/start.sh
+```
+
+Your function is now listening on port `3000`, and you can execute it by sending `POST` request with appropriate authorization headers. To learn more about runtime, you can visit Kotlin runtime [README](https://github.com/open-runtimes/open-runtimes/tree/main/runtimes/kotlin-1.6/example).
+
+4. In new terminal window, execute the function. Example curl command (Email):
+
+```bash
+curl -X POST http://localhost:3000/ -d '{"variables": {"MAILGUN_API_KEY":"YOUR_MAILGUN_API_KEY","MAILGUN_DOMAIN":"YOUR_MAILGUN_DOMAIN"},"payload": "{\"type\": \"Email\",\"receiver\": \"[email protected]\",\"message\": \"Programming is fun!\",\"subject\": \"Programming is funny!\"}"}' -H "X-Internal-Challenge: secret-key" -H  "Content-Type: application/json"
+```
+
+## 📝 Notes
+
+- This function is designed for use with Appwrite Cloud Functions. You can learn more about it in [Appwrite docs](https://appwrite.io/docs/functions).

kotlin/sendMessage/deps.gradle

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+dependencies {
+    implementation 'com.google.code.gson:gson:2.9.0'
+    implementation 'com.chromasgaming:ktweet:1.3.0'
+}