Update README.md and index.html

README.md

@@ -1,4 +1,5 @@
 # Artspeak : creative coding platform
+**Use it at https://mrdaybird.github.io/artspeak/**
 
 - At this point, it is basically a clone of [tixy.land](https://tixy.land/)
 
@@ -7,7 +8,25 @@
 ## How?
 
 - [x] For desktop -> write a language from scratch and use raylib for graphics
-- [ ] For web -> compile to html and wasm using emscripten
+- [x] For web -> compile to html and wasm using emscripten
+- [ ] Add more functions and operations
+
+## Syntax
+
+You have four read-only variables. 
+
+- **t**: time
+- **i**: index
+- **x**: x-axis position
+- **y**: y-axis position
+
+You can write an expression with these four variables and provided math functions.
+
+Supported functions and operations:
+- sin, cos, tan.
+
+Upcoming:
+- power(**/^), abs, random, sqrt, and more...
 
 ## Using artspeak
 
@@ -16,3 +35,9 @@ For now, I have locally tested only on my machine(linux)
 Dependencies: [fmt](https://fmt.dev/), [raylib](https://www.raylib.com/)
 
 Then cmake into a build folder, hopefully it should work.
+
+To build web version:
+```
+emcmake cmake -S . -B build-web -DPLATFORM=Web -G Ninja
+cmake --build build-web
+```

index.html

@@ -8,6 +8,8 @@
     <div class="repl">
       <span class="banner">
         <p>Welcome to artspeak!</p>
+        <p>You have 4 variables t,i,x,y.</p>
+        <p>t is time, i is index, x is x-axis position, y is y-axis position.</p>
         <p>Write your code below and have fun!</p>
       </span>
     </div>