[ADDED]: Readme file

README.md

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+# Basic expressions calculator
+
+This is an algorithm for calculate many operations at the same time, at the last update is not possible to use parenthesis.
+
+So an example could be:
+
+````
+12+2-3+12/2*5
+````
+The result would be
+````
+--- Details ---
+2*5: 10
+12/10: 1.2
+12+2: 14
+-3+1.2: -1.8
+14-1.8: 12.2
+--- Done ---
+The result is: 12.2
+````
+As we can see the details displayed, the expression is resolved in order of "Math Order of Operations":
+
+1. Multiplication
+2. Division
+3. Addition
+4. Subtraction
+
+This respository will be updated on the way of my learning path. So I'll be adding features or improvements.