Created Bag of Tricks (markdown)

Bag-of-Tricks.md

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+Here are helper class that can help you add missing features.
+
+## Buffered output:
+
+Here is a proxy that will put bytes in a buffer before actually writing them to the destination:
+
+```c++
+template <size_t CAPACITY>
+class BufferedPrint : public Print {
+ public:
+  BufferedPrint(Print& destination) : _destination(destination), _size(0) {}
+
+  ~BufferedPrint() { flush(); }
+
+  virtual size_t write(uint8_t c) {
+    _buffer[_size++] = c;
+
+    if (_size + 1 == CAPACITY) {
+      flush();
+    }
+  }
+
+  void flush() {
+    buffer[_size] = '\0';
+    _destination.print(_buffer);
+    _size = 0;
+  }
+
+ private:
+  Print& _destination;
+  size_t _size;
+  char _buffer[CAPACITY];
+};
+```
+
+To use this in your code:
+
+```c++
+root.printTo(BufferedPrint<256>(Serial));
+```
+
+See issue [#166](https://github.com/bblanchon/ArduinoJson/issues/166).
+