Дополнения в описание проекта / Some addions in the description of the project

docs/english/Vector2.md

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+# Two dimensional vectors
+
+There are two types for two dimensional vectors:
+- BgFP32Vector2 for single precision vectors
+- BgFP64Vector2 for double precision vectors
+
+Vectors of BgFP32Vecto2 type use **float** (binary32 of IEEE 754) type to store
+coordinate values.
+
+Vectors of BgFP64Vecto2 type use **double** (binary64 of IEEE 754) type to store
+coordinate values.
+
+The both types are structures with two fields: **x1** and **x2**
+
+The definition of the types:
+
+    typedef struct
+    {
+        float x1, x2;
+    } BgFP32Vector2;
+
+    typedef struct
+    {
+        double x1, x2;
+    } BgFP64Vector2;
+