Updated and renamed README.txt to README.md (llvm#106198)

Co-authored-by: Tarık Çelik <[email protected]>

Author: tarik-celik

clang/README.md

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+# C language Family Front-end
+
+Welcome to Clang. 
+
+This is a compiler front-end for the C family of languages (C, C++ and Objective-C) which is built as part of the LLVM compiler infrastructure project.
+
+Unlike many other compiler frontends, Clang is useful for a number of things beyond just compiling code: we intend for Clang to be host to a number of different           source-level tools. One example of this is the Clang Static Analyzer.
+
+If you're interested in more (including how to build Clang) it is best to read the relevant websites. Here are some pointers:
+
+* Information on Clang:      http://clang.llvm.org/
+
+* Building and using Clang:    http://clang.llvm.org/get_started.html
+
+* Clang Static Analyzer:    http://clang-analyzer.llvm.org/
+
+* Information on the LLVM project:    http://llvm.org/
+
+* If you have questions or comments about Clang, a great place to disucss them is on the Clang forums:    
+  
+  [Clang Frontend - LLVM Discussion Forums](https://discourse.llvm.org/c/clang/)
+
+* If you find a bug in Clang, please file it in the LLVM bug tracker:
+  
+    https://github.com/llvm/llvm-project/issues