Create README.md

Author: sawenzel

README.md

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+# O2CodeChecker
+A prototype for a standalone code checker for the AliceO2 project
+
+It offers:
+  * code checks based on clang-tidy and existing components
+  * standalone CMake infrastructure for compilation outside of llvm/clang source tree
+
+# Requirements/Building
+
+  * llvm + clang + clang extra tools (release 3_9) required
+  * build using `cmake -DLLVM_DIR=PATH_TO_LLVM_CMAKE_CONFIG -DClang_DIR=PATH_TO_CLANG_CONFIG`