THRIFT-3221 Create a tool to audit network compatibility between two
.thrift files
Client: Compiler (general)
Patch: Sanjay Poojary <sanjay.poojary@ni.com>, Ben Craig
<bencraig@apache.org>, and Zach Hindes <zach.hindes@ni.com>

This closes #541
diff --git a/compiler/cpp/src/audit/readme.txt b/compiler/cpp/src/audit/readme.txt
new file mode 100644
index 0000000..f1c53e3
--- /dev/null
+++ b/compiler/cpp/src/audit/readme.txt
@@ -0,0 +1,32 @@
+Typical usage:
+    thrift.exe --audit <oldFile> <newFile>
+Example run:
+    > thrift.exe --audit test.thrift break1.thrift
+    [Thrift Audit Failure:break1.thrift] New Thrift File has missing function base_function3
+    [Thrift Audit Warning:break1.thrift] Constant const3 has different value
+
+Problems that the audit tool can catch:
+Errors
+    Removing an enum value
+    Changing the type of a struct field
+    Changing the required-ness of a struct field
+    Removing a struct field
+    Adding a required struct field
+    Adding a struct field 'in the middle'.  This usually indicates an old ID has been recycled
+    Struct removed
+    Oneway-ness change
+    Return type change
+    Missing function
+    Missing service
+    Change in service inheritance
+Warnings
+    Removing a language namespace declaration
+    Changing a namespace
+    Changing an enum value's name
+    Removing an enum class
+    Default value changed
+    Struct field name change
+    Removed constant
+    Type of constant changed
+    Value of constant changed
+    
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