Updates readme

README.md

@@ -1,23 +1,49 @@
 # ESRI C++ code assignment
 
+## Requirements
+
+The requirements specification is provided in `assignment.pdf`.
+
+
+## Design remarks
+
+For sake of simplicity most of validation and error handling is performed during
+loading the input files.
+
+
 ## Setup
 
-```
-aptitude install protobuf-compiler libprotobuf-c-dev ##libprotoc-dev
-```
+Execute the bash script `install_deps.sh` on a Debian GNU/Linux system to install
+the required dependencies.
+
+The protobuf dependencies are installed as Debian packages. All other dependencies
+are installed using the CMake FetchContent feature.
 
 ## Build
 
+Execute the bash script `build.sh` to perform both build and testing steps.
+
+The overall process is implemented using CMake. The application artifact is located
+at `build/src/main`.
+
+
+## Usage
+
+The command-line parameters can be passed as follows:
 ```
-mkdir build
-cd build
-cmake ..
-make
+main <input-file[s]> <json-ouput-file>
 ```
 
+* At least one *input-file* and *json-ouptut-file* must be provided.
+* Multiple *input-files* are supported.
+
 
 ## Links
+* Protobuf
   * https://developers.google.com/protocol-buffers/docs/cpptutorial
   * https://github.com/protocolbuffers/protobuf/tree/master/examples
   * https://cmake.org/cmake/help/latest/module/FindProtobuf.html
-
+* Json C++ library
+  * https://github.com/nlohmann/json
+* Catch2 unit testing framework
+  * https://github.com/catchorg/Catch2