made examples/demos for vectors && files && lists | also fixed a bug with the vector and list size and popping, explained in the adjacent comment

examples/vector/vectordemo.c

@@ -0,0 +1,21 @@
+#include <odweta/vector.h>
+#include <stdio.h>
+
+int main() {
+    printf("creating a vector using 'vectorInit(<type>)' (returns a vector_t*)\npossible type are: INT, FLOAT, CHAR, VECTOR (LIST in the future)\n");
+    vector_t* v = vectorInit(INT);
+
+    printf("pushing an integer value into the vector\nnote the kind of unusual way of passing the number argument: if you want to pass an expression (e.g. the value '1' or '4*4'), something not stored in a variable, you follow this syntax - &(type){value} (e.g. &(int){1 + 1})\n->'vectorPush(vector_t*, &(int){123})'\n");
+    vectorPush(v, &(int){123});
+    vectorPrint(v);
+
+    printf("popping the last value of the vector; in this case, it is an integer, so you type: 'int poppedValue = *((int *)vectorPop(vector_t*))'\n");
+    int poppedValue = *((int *)vectorPop(v));
+	printf("popped: %d\n", poppedValue);
+    vectorPrint(v);
+
+    printf("if you are finished working with the vector BEFORE the immediate end of the program, run 'vectorCleanup(vector_t*)', otherwise it is not strictly necessary\n");
+    vectorCleanup(v);
+
+    return 0;
+}