created crud app for mongodb

Signed-off-by: Pranav5255 <pranavmetil@gmail.com>

Author: Pranav5255

crud-app-mongodb/README.md

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+# Sample CRUD application
+
+This is a sample C# application that demonstrates the usage of Keploy with .NET and MongoDB.
+
+## Get Started with Keploy
+
+1. **Install Keploy**
+```bash
+curl -L https://github.com/keploy/keploy/releases/latest/download/keploy_linux_amd64.tar.gz -o keploy.tar.gz
+tar -xzf keploy.tar.gz
+sudo mv keploy /usr/local/bin/
+sudo chmod +x /usr/local/bin/keploy
+rm keploy.tar.gz
+
+# Verify installation
+keploy version
+```
+
+2. **Setup application**
+```bash
+git clone https://github.com/keploy/samples-csharp.git
+cd samples-csharp/crud-app-mongodb
+```
+
+## Prerequisites
+
+### Install .NET 8 SDK and Runtime
+
+```bash
+# Download and install Microsoft repository configuration
+wget https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
+sudo dpkg -i packages-microsoft-prod.deb
+rm packages-microsoft-prod.deb
+
+# Update package lists
+sudo apt-get update
+
+# Install .NET 8 Runtime and SDK
+sudo apt-get install -y dotnet-runtime-8.0 aspnetcore-runtime-8.0 dotnet-sdk-8.0
+
+# Verify installation
+dotnet --version
+```
+
+### Install and Start MongoDB
+
+```bash
+# Import MongoDB public GPG key
+wget -qO - https://www.mongodb.org/static/pgp/server-7.0.asc | sudo apt-key add -
+
+# Create list file for MongoDB
+echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/7.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-7.0.list
+
+# Update package database
+sudo apt-get update
+
+# Install MongoDB
+sudo apt-get install -y mongodb-org
+
+# Start MongoDB
+sudo systemctl start mongod
+
+# Enable MongoDB to start on boot
+sudo systemctl enable mongod
+
+# Verify MongoDB is running
+sudo systemctl status mongod
+```
+
+### Configuration
+
+Update `appsettings.json` with your MongoDB connection string (default configuration works with local MongoDB):
+
+```json
+{
+  "MongoDBSettings": {
+    "ConnectionString": "mongodb://localhost:27017",
+    "DatabaseName": "UserDb",
+    "UsersCollectionName": "Users"
+  }
+}
+```
+
+## Running in Record Mode
+
+```bash
+sudo -E env "PATH=$PATH" keploy record -c "dotnet run" --proxy-port 8080 --path ./keploy-tests
+```
+
+**Note:** Keploy requires elevated permissions (sudo) to use eBPF for intercepting network calls.
+
+Now, since we have our application up and running, let's perform a few cURL requests (in a new terminal):
+
+### 1. POST Requests
+
+```bash
+curl -X POST -H "Content-Type: application/json" -d '{"name":"Sarthak Shnygle","age":23}' http://localhost:5067/api/users
+
+curl -X POST -H "Content-Type: application/json" -d '{"name":"Gourav Kumar","age":22}' http://localhost:5067/api/users
+```
+
+### 2. GET Request
+
+```bash
+curl http://localhost:5067/api/users
+```
+
+### 3. GET Request by ID
+
+```bash
+# Replace {id} with actual ID from POST response
+curl http://localhost:5067/api/users/{id}
+```
+
+### 4. DELETE Request
+
+```bash
+# Replace {id} with actual ID from POST response
+curl -X DELETE http://localhost:5067/api/users/{id}
+```
+
+And voila, we have our test cases generated in the `./keploy-tests` directory!
+![Testcases](./img/photo1.png)
+
+### Stop Recording
+
+Press `Ctrl+C` in the terminal where Keploy is running to stop recording.
+
+## Run the Test Cases
+
+Now let's run Keploy in test mode:
+
+```bash
+sudo -E env "PATH=$PATH" keploy test -c "dotnet run" --path ./keploy-tests --delay 10
+```
+
+The `--delay 10` flag gives the .NET application 10 seconds to start before running tests.
+
+Keploy will replay all recorded test cases and generate a test report in the `keploy-tests/reports` directory.
+
+![Testcases](./img/photo2.png)
+
+
+
+## Troubleshooting
+
+### Port Already in Use
+
+If you get an "address already in use" error:
+
+```bash
+# Kill existing dotnet processes
+pkill -9 dotnet
+```
+
+### MongoDB Not Running
+
+Ensure MongoDB is running:
+
+```bash
+sudo systemctl status mongod
+
+# If not running, start it
+sudo systemctl start mongod
+```
+
+### Permission Denied
+
+Always use `sudo -E env "PATH=$PATH"` with Keploy commands to preserve environment variables and provide necessary permissions for eBPF.
+
+## API Endpoints
+
+- `GET /api/users` - Get all users
+- `POST /api/users` - Create a new user
+- `GET /api/users/{id}` - Get user by ID
+- `PUT /api/users/{id}` - Update user by ID
+- `DELETE /api/users/{id}` - Delete user by ID
+
+## Resources
+
+- [Keploy Documentation](https://keploy.io/docs)
+- [.NET 8 Documentation](https://learn.microsoft.com/en-us/dotnet/core/whats-new/dotnet-8)
+- [MongoDB .NET Driver](https://www.mongodb.com/docs/drivers/csharp/)