add readme

Author: StachV

Examples/ConcreteBridge/README.md

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+# Script for generating basic concrete bridge
+script generates simple bridge structure based on provided parameters
+
+there are two groups of parameters:
+
+-primary parameters - general dimensions of the structure, load magnitude
+
+-secondary parameters - that are by default derived from the primary parameters, but can be adjusted manually
+
+One loadcase is generated as a "live load" that can be adjusted to act on whole bridge or on alternating bridge fields.
+
+There is no GUI or terminal input provided, parameters are meant to be changed in the script itself and then run.
+
+![image](demo_image.png)
+
+
+