added coding style guide

STYLE.MD

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+# k9core coding style
+
+Pretty similar to the GNU code standards.
+
+## Functions definition
+
+Functions have to begin with return type, breakline, and functionname,
+also brackets will be in a new line:
+
+~~~c
+int
+main(int argc, char *argv[])
+~~~
+
+## Line length
+
+A line of code must no exced 75 characters. If it exceeds, do a
+breakline:
+
+~~~c
+
+int 
+a_very_long_function(int a_very_long_parameter, int
+                     another_very_long_parameter);
+~~~
+
+## Statements
+
+Do not do declarations inside an if block. Declarations inside while
+loop are OK.
+
+~~~c
+int fd;
+if((fd = open("file", O_CREAT)) == -1) /* Don't do this */
+{
+ /* Whatever */
+}
+
+/* Do this instead */
+
+int fd = open("file", O_CREAT);
+if(fd == -1) 
+{
+	/* Whatever */
+}
+~~~
+
+## Comments
+
+Do not use C++ style comments. Comments at beggining of the line
+should explain what the line does. not how it does. Comments at the
+end of the line must be explanations of something:
+
+~~~c
+// This is a wrong comment
+
+/* This is a correct comment */
+
+/* Makes a syscall giving a file descriptor... */
+
+fd = open("whatever",O_RDONLY); /* WRONG */
+
+/* Creates a file descriptor on the file whatever */
+
+fd = open("whatever",O_RDONLY); /* Yes */
+
+/* 420 is 644 in decimal */ <- WRONG
+chmod("whatever",420)
+
+chmod("whatever",420) /* 420 is 644 in decimal
+
+~~~