Added a handful of links to related projects

Interesting open-source projects that I've ran into around embedded
storage. May be interesting to others in the embedded space.

Added mklfs, SPIFFS, and Dhara.

Also a thanks to jolivepetrus for posting the mklfs tool he put
together.

README.md

@@ -175,3 +175,18 @@ handy.
 [littlefs-js](https://github.com/geky/littlefs-js) - A javascript wrapper for
 littlefs. I'm not sure why you would want this, but it is handy for demos.
 You can see it in action [here](http://littlefs.geky.net/demo.html).
+
+[mklfs](https://github.com/whitecatboard/Lua-RTOS-ESP32/tree/master/components/mklfs/src) -
+A command line tool built by the [Lua RTOS](https://github.com/whitecatboard/Lua-RTOS-ESP32)
+guys for making littlefs images from a host PC. Supports Windows, Mac OS,
+and Linux.
+
+[SPIFFS](https://github.com/pellepl/spiffs) - Another excellent embedded
+filesystem for NOR flash. As a more traditional logging filesystem with full
+static wear-leveling, SPIFFS will likely outperform littlefs on small
+memories such as the internal flash on microcontrollers.
+
+[Dhara](https://github.com/dlbeer/dhara) - An interesting NAND flash
+translation layer designed for small MCUs. It offers static wear-leveling and
+power-resilience with only a fixed O(|address|) pointer structure stored on
+each block and in RAM.