created a root readme in the examples folder

examples/README.md

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+# Leo Examples
+
+This directory includes the following Leo code examples:
+
+1. Hello World -> Basic Sum of two u32
+2. Groups -> Basic operations over groups
+3. Core -> Core circuits functions over a field type
+4. Bubblesort -> Sorting algorithms over a tuple
+5. Import point -> Import code from an other file 
+6. Message -> Initialization of a circuit type 
+7. Token -> Record example
+
+## Build Guide
+
+To compile each example, run:
+```bash
+leo build
+```
+When you run this command for the first time the snarkvm parameters (universal setup) will be downloaded, these are necessary to run the circuits.
+
+To run each program, run:
+```bash
+leo run main
+```
+This command will look in the input file inputs/*.in where should find a section [main] and use the variables as inputs to the program.