created GeneralTipsAndTools tip

Author: stephengaito

docs/TipsAndTricks/GeneralTipsAndTools.md

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+# General tips
+
+## g++
+
+To get the list of g++ warnings:
+
+  g++ --help=warnings
+
+## clang++
+
+To get the list of clang++ warnings, see [Diagnostic flags in 
+Clang](https://clang.llvm.org/docs/DiagnosticsReference.html).
+
+Generally all warnings flags which g++ implements will be implemented by 
+clang++. BUT they might be implemented differently (and hence triggered on 
+slightly different conditions).
+
+See: [Clang 
+tools](https://github.com/llvm-mirror/clang/blob/master/docs/ClangTools.rst)
+
+## clang-tidy
+
+See: 
+[Clang-tidy](https://github.com/llvm/llvm-project/blob/master/clang-tools-extra/docs/clang-tidy/index.rst)
+
+See:
+[Clang-Tidy](https://clang.llvm.org/extra/clang-tidy/)
+
+## clang-check
+
+See:
+[Clang-check](http://manpages.org/clang-check)
+
+## Other tools
+
+See:
+  * [Clang-query]
+    (https://devblogs.microsoft.com/cppblog/exploring-clang-tooling-part-2-examining-the-clang-ast-with-clang-query/)
+  * [AST Matcher 
+    Reference](https://clang.llvm.org/docs/LibASTMatchersReference.html)
+  * [Matching the Clang AST](https://clang.llvm.org/docs/LibASTMatchers.html)