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+## PocketCalclator - Readme
+
+**PocketCalclator** is first of all a study to identify the possiblities to develop simple software tools for mobile devices. These tools shall be platform indipendant, thus it runs entirely on HTML and Javascript
+
+### Application Taschenrechner
+
+As application, this program *Taschenrechner.html* can ben used by mouse or touchscreen clicks as well as via a keyboard.
+
+The bottom line serves to input the numbers. The functions (currently root/square/ln) also operate on this number. Once an operator (#-/*) is pressed it is copied to the first line where the formular is shown.
+
+Pressing "=" calculates the result, which is shown in the middle line.
+
+The following keys are available:
+
+* e: to enter exponentials, such as `1e3` which stands for 1*10^3
+* "DEL" or key `backspace`: deletes last digit.
+* "C" or key `ESC`: deletes input number, formular and result display
+* "√" or key "r": calculates the root of the number in the input field
+* "x²" or key "S": calculates the square of the number in the input field
+* "ln" or key "l": calculates the natural logarithm of the number in the input field
+* "STO" or key "s": stores the result to memory
+* "RCL" or key "m": recalls the results from memory
+* "ANS" or key "a": recalls the last result
+* "=" or key "Enter": provides the result of the formular
+* "ENG" or key "n": toggles notation between exponential and floating point display
+
+### License
+The entire project is subject to GPL v3.0
+