add readme

Needs a hosting guide too.

Signed-off-by: Gunwant Jain <mail@wantguns.dev>

readme

@@ -0,0 +1,36 @@
+    USAGE
+    -----
+
+        POST    / 
+
+            accepts raw data in the body of the request and responds with a URL
+            of a page containing the body's content
+
+        GET     /<id>
+
+            retrieves the content for the paste with id `<id>`
+
+        GET     /p/<id>
+
+            retrieves the HTML page with syntax-highlighted content for the paste with id `<id>`
+ 
+    EXAMPLES
+    --------
+
+        Paste a file named 'file.txt' using cURL:
+
+            curl -d@file.txt https://bin.wantguns.dev
+
+        Paste from stdin using cURL:
+
+            echo "Hello, world." | curl -d@- https://bin.wantguns.dev
+
+        Add this to your .zshrc to implement a quicker usage.
+
+            function paste() {
+              local file=${1:-/dev/stdin}
+              curl -d@${file} https://bin.wantguns.dev
+            }
+
+        If the uploaded data binary is parsed as "text/*", then the paste will be syntax
+        highlighted

src/main.rs

@@ -69,7 +69,7 @@ fn upload(paste: Data) -> Result<String, std::io::Error> {
 
 #[get("/")]
 fn index() -> &'static str {
-    "\
+"   
     USAGE
     -----