add To-Do's in README.md

README.md

@@ -6,7 +6,20 @@ I made Rizzy as a learning project. I followed Thorsten Ball's book “Writing A
 
 Rizzy is language with 6 data types (`Integer`, `Float`, `Boolean`, `String`, `Array`, `Map`) and a `NULL`. Rizzy has first-class functions with closure. Everything in Rizzy is a expression (function) except def (Define) statements and return statements. So if you type `5` it's actually a expression that evaluates 5. 
 
-### Examples
+## To-Do
+
+- [x] Floats
+- [ ] Error traceback
+- [ ] Better terminal integration (use arrow keys on REPL)
+- [ ] GTE ("<=") and LTE (">=")
+- [ ] Comparing INTEGER and FLOAT
+- [ ] INTEGER -> FLOAT and FLOAT -> INT
+- [ ] AND ("&&") and OR ("||")
+- [ ] Built-in function for formatting ("fmt()")
+
+
+
+## Examples
 
 With `def` keyword you can define variables and functions. 
 
@@ -40,9 +53,9 @@ def mymap = {"name": "Rizzler", "version": 1};
 mymap["name"];
 ```
 
-#### Built-in Functions
+### Built-in Functions
 
-##### `puts` and `rizz`
+#### `puts` and `rizz`
 
 They have the same definition.
 Prints the arguments in their own line and returs an null. So the use is just:
@@ -59,49 +72,49 @@ Rizzler: null
 
 Notice that it says "null" in the end. It does not evaluate anything. So if you say `def a = puts("a");`, `a;` will give you `null`.
 
-##### `exit`
+#### `exit`
 
 Exits the interpreter, with an optional exit status code (default=0).
 
 
-##### `len`
+#### `len`
 
 Returns the length of the input as INTEGER. Takes 1 input, ARRAY or STRING.
 
 
-##### `first`
+#### `first`
 
 Returns first element of an array. Takes an ARRAY as argument. Same as using `array[0]`.
 
 
-##### `last`
+#### `last`
 
 Returns last element of an array. Takes an ARRAY as argument. Same as using `array[len(array)-1]`.
 
-##### `head`
+#### `head`
 
 Returns the array without the last element. Takes an ARRAY as argument. 
 
 
-##### `tail`
+#### `tail`
 
 Returns the array without the first element. Takes an ARRAY as argument. 
 
 
-##### `push`
+#### `push`
 
 Takes 2 arguments. Takes an ARRAY as first argument and an Expression as second. Returns an ARRAY with result of the given expression as last element.
 
 
-##### `pop`
+#### `pop`
 
 Takes 1 arguments and 1 optional argument. Takes an ARRAY as first argument and an Expression as second. Returns an ARRAY without the element with index of result of the given expression.
 
-##### `pow`
+#### `pow`
 
 Takes 2 arguments. Takes two INTEGER. Returns an INTEGER. `pow(2,2)` = `4`
 
-##### `sqrt`
+#### `sqrt`
 
 Takes 1 argument. Takes an INTEGER. Returns an INTEGER. `sqrt(4)` = `2`