Added string contains article

Author: waqasm78

docs2/pages/documentations/string/string-contains.md

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+# String_Contains
+
+`String_Contains` returns a value indicating whether a specified substring occurs within this string.
+
+```csharp
+String_Contains (
+	@source NVARCHAR (MAX), 
+	@target NVARCHAR (MAX)
+	)
+RETURNS BIT
+```
+
+## Parameters
+
+  - **source**: The source string.
+  - **target**: The string to search within source string.
+
+## Returns
+
+ `true` if the target parameter occurs within the source string, or if target is the empty string (""); otherwise, `false`.
+
+## Example
+
+```csharp
+SELECT SQLNET::String_Contains('This is a string.', 'string')
+```
+
+# String_Contains4k
+
+It is equivalent to `String_Contains` except no NVARCHAR(MAX) parameters; it can be used when input data will never be over 4000 characters as this function offers better performance.
+
+```csharp
+String_Contains4k (
+	@source NVARCHAR (4000), 
+	@target NVARCHAR (4000)
+	)
+RETURNS BIT
+```
+
+## Example
+
+```csharp
+SELECT SQLNET::String_Contains4k('This is a string.', 'string')
+```

docs2/pages/documentations/string/string-endswith.md

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+# String_EndsWith
+
+`String_EndsWith` determines whether the end of the source string instance matches a target string.
+
+```csharp
+String_EndsWith (
+	@source NVARCHAR (MAX), 
+	@target NVARCHAR (MAX)
+	)
+RETURNS BIT
+```
+
+## Parameters
+
+  - **source**: The source string.
+  - **target**: The string to compare to the substring at the end of the source string.
+
+## Returns
+
+ `true` if the target matches the end of the source string; otherwise, `false`.
+
+## Example
+
+```csharp
+SELECT SQLNET::String_EndsWith('This is a string.', 'string.')
+```
+
+# String_EndsWith4k
+
+It is equivalent to `String_EndsWith` except no NVARCHAR(MAX) parameters; it can be used when input data will never be over 4000 characters as this function offers better performance.
+
+```csharp
+String_EndsWith4k (
+	@source NVARCHAR (4000), 
+	@target NVARCHAR (4000)
+	)
+RETURNS BIT
+```
+
+## Example
+
+```csharp
+SELECT SQLNET::String_EndsWith4k('This is a string.', 'string.')
+```