add C resources

CONTRIBUTING.md

@@ -0,0 +1,16 @@
+# Contribution Guidelines
+
+## Adding to this list
+
+Please ensure your pull request adheres to the following guidelines:
+
+- Make an individual pull request for each suggestion.
+- Use the following format: `[Resource Name](link) - Short description.`
+- Don't repeat the resource name in the description.
+- Link additions should be added in alphabetical order to the relevant category.
+- Titles should be [capitalized](http://grammar.yourdictionary.com/capitalization/rules-for-capitalization-in-titles.html).
+- Check your spelling and grammar.
+- New categories or improvements to the existing categorization are welcome.
+- The pull request and commit should have a useful title.
+
+Thank you for your suggestions!

README.md

@@ -53,7 +53,10 @@ A collection of awesome web crawler,spider and resources in different language
 * [php-spider](https://github.com/mvdbos/php-spider) - A configurable and extensible PHP web spider.
 
 ## C++
-* [open-source-search-engine](https://github.com/gigablast/open-source-search-engine) - A distributed open source search engine and spider/crawler written in C/C++. 
+* [open-source-search-engine](https://github.com/gigablast/open-source-search-engine) - A distributed open source search engine and spider/crawler written in C/C++.
+
+## C
+* [httrack](https://github.com/xroche/httrack) - Copy websites to your computer.
 
 ## Ruby
 * [upton](https://github.com/propublica/upton) - A batteries-included framework for easy web-scraping. Just add CSS(Or do more).