Create README.md

README.md

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+# About
+This project is MIT-licensed, C++14 implementation of [semantic versioning](http://semver.org) parser and comparator. Semantic versioning 2.0.0 specification is supported out-of-the-box and the code should be flexible-enough to support future revisions or other similar versioning schemes.
+
+# Usage
+Parsing and comparing two version strings:
+```c++
+#include "semver200.h"
+
+void main(int, char**) {
+    version::Semver200_version v1("1.0.0");
+    version::Semver200_version v2("2.0.0");
+
+    if (v2 > v1) {
+        std::cout << v2 << " is indeed greater than " << v1 << std::endl;
+    } else {
+        std::cout << "This thing is broken, what a waste of time!" << std::endl;
+    }
+}
+```
+
+Accessing individual version components:
+
+```c++
+#include "semver200.h"
+
+void main(int, char**) {
+    version::Semver200_version v("1.2.3-alpha.1+build.no.123");
+    std::cout << "Major: " << v.major() << std::endl;
+    std::cout << "Minor: " << v.minor() << std::endl;
+    std::cout << "Patch: " << v.patch() << std::endl;
+    std::cout << "Pre-release: " << v.prerelease() << std::endl;
+    std::cout << "Build: " << v.build() << std::endl;
+}
+```
+
+should generate following output:
+```
+Major: 1
+Minor: 2
+Patch: 3
+Pre-release: alpha.1
+Build: build.no.123
+```
+
+# Build
+The code is written in C++14, so, fairly recent compiler is required to build it. Following compiler were tested:
+- Microsoft Visual Studio 2015
+- GCC 5.1.1
+- Clang 3.7.0
+
+Library itself does not have any external dependencies. Unit tests that verify the library work as expected, on the other hand, depend on the [Boost.Test](http://www.boost.org/doc/libs/1_59_0/libs/test/doc/html/index.html) library. If you do not have and do not want to install Boost.Test, then comment out appropriate section of CMakeLists.txt file.
+
+The code comes with CMake project files. In order to build it you should:
+
+- create, if it doesn’t already exist, directory `build` in the project directory;
+- invoke `cmake ..` in build directory;
+- once CMake is done, use your toolset (Visual Studio, nmake, make, …) to build the library;
+- remember to link in the library you have built and to include `./include` directory to your build.