docs: add swift guide

Signed-off-by: Moksh Pathak <[email protected]>

Author: moksh-pathak

docs/WebAssembly/Swift.md

@@ -0,0 +1,87 @@
+# WebAssembly with SwiftWasm
+
+1. Setting up the environment
+    
+    First, we need to pull the docker image and run it in an interactive mode; we would be accessing the container from its bash. To do the same, run the following command.
+    
+    ```
+    docker run --rm -it ghcr.io/swiftwasm/swift:latest /bin/bash
+    ```
+    
+    
+2. Code
+    
+    To write the fibonacci code, we need to have a text editor in the container. For this demo, we would be using nano text editor. To install the same, follow the below instructions :
+    
+    1. First, we need to run the `apt update` command in our container.
+    2. To install nano text editor using apt, we need to run `apt install nano`
+    
+    With our text editor now installed in the container, lets make a swift file and write the fibonacci code in it.
+    
+    To make a new file, we would be using the `touch` command.
+    
+    ```
+    touch fibonacci.swift
+    ```
+    
+    To open the newly created file in nano text editor, we use this simple command.
+    
+    ```
+    nano fibonacci.swift
+    ```
+    
+    The fibonacci code in Swift is as follows :
+    
+    ```
+    func fibonacci(n: Int) -> Int {
+        var a = 0
+        var b = 1
+        for _ in 0..<n {
+            let temp = a
+            a = b
+            b = temp + b
+        }
+        return a
+    }
+    
+    print(fibonacci(n:7))
+    ```
+    
+3. Compiling the code
+    
+    To compile your Swift code to wasm, simply run:
+    
+    ```
+    swiftc -target wasm32-unknown-wasi fibonacci.swift -o fibonacci.wasm
+    ```
+    
+    This would generate a `fibonacci.wasm` file.
+    
+
+4. Running .wasm file in Wasmtime
+    
+    We would be using Wasmtime as our WebAssembly runtime to run our `fibonacci.wasm` file. Before we install wasmtime in our container, we would need to install `curl` command, which is a command-line tool to transfer data to or from a server. To install the `curl` command, run the following command :
+    
+    ```
+    apt install curl
+    ```
+    
+    With that done, lets install our WebAssembly runtime, Wasmtime with the following command.
+    
+    ```
+    curl https://wasmtime.dev/install.sh -sSf | bash
+    ```
+    
+    We need to open a new terminal to start using Wasmtime, but the same can be achieved simply by the following command.
+    
+    ```
+    exec bash
+    ```
+    
+    To run our `fibonacci.wasm` , run the following command :
+    
+    ```
+    wasmtime fibonacci.wasm
+    ```
+    
+