Add Readme

README.md

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+# addtopath
+Adds the first argument to USER PATH environment variable without truncating it like setx. 
+
+This program only works on windows.
+
+# Usage
+```
+> addtopath <path-to-directory>
+```
+
+# Example
+```
+> addtopath .\bin
+Added Directory to path
+```
+
+# Building
+Building with gcc
+```
+
+```