Added the random crypto module with its default implementation, implemented the Ed25519 keys generation function

src/crypto/random.zig

@@ -0,0 +1,15 @@
+pub const Implementation = struct {
+    generate: *const fn (out: []u8) void,
+};
+
+// TODO
+pub const defaultImplementation = struct {
+    
+    pub fn generate(out: []u8) void {
+        // WARNING This is not secure at all, use only for testing purposes
+        for(out) |*byte| {
+            byte *= undefined;
+        }
+    }
+};
+