added jump search in c++

.gitignore

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+# OS generated files 
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db

searching/README.md

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+# Searching algorithms
+
+### c-or-cpp
+
+1. linear-search.cpp
+2. binary-search.cpp
+3. jump-search.cpp
+
+### python
+
+1. linear-search.py
+2. binary-search.py
+

sorting/README.md

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+# Sorting algorithms
+
+### c-or-cpp
+
+1. bubble-sort.cpp
+
+### python
+
+1. bubble-sort.py
+
+

strings/README.md

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+# String operations
+
+### c-or-cpp
+
+1. palindrome check (palindrome.c)