Update docs

Author: vshymanskyy

docs/Demos.md

@@ -4,3 +4,5 @@
 - **Basic WiFi/Gpio access, updating `wasm` file over-the-air** │ [demo](https://twitter.com/alvaroviebrantz/status/1221618910803513344), [github](https://github.com/alvarowolfx/wasm-arduino-wifi) [ESP32 / Web] 
 - **RGB lamp animation using WebAssembly** │ [demo](https://twitter.com/wasm3_engine/status/1222835097289752576), [github](https://github.com/vshymanskyy/Wasm3_RGB_Lamp) [nRF51 / nRF52 / ESP8266 / ESP32]
 - **LCD display rendering with AssemblyScript** │ [demo](https://twitter.com/h1romas4/status/1228581467850100736), [github](https://github.com/h1romas4/m5stack-wasm3-testing) [M5Stack / ESP32]
+- **Conway's Game Of Life with AssemblyScript** │ [demo](https://www.youtube.com/watch?v=Hc2sbhGMrig), [github](https://github.com/h1romas4/maixduino-wasm3-testing) [Maixduino / K210]
+

docs/Development.md

@@ -92,3 +92,40 @@ ninja
 ## Build for microcontrollers
 
 In `./platforms/` folder you can find projects for different targets. Some of them are using Platformio, so you can follow the regular pio build process. Others have custom instructions in respective `README.md` files.
+
+## Build with WasiEnv
+
+```sh
+wasimake cmake -GNinja ..
+ninja
+```
+
+If you want to enable experimental WASM features during the build:
+
+```sh
+export CFLAGS="-Xclang -target-feature -Xclang +tail-call"
+wasimake cmake -GNinja ..
+ninja
+```
+
+Here's how some options can be used with different tools:
+
+```log
+Clang target-feature option          WABT option                        Chromium --js-flags option
+----------------------------------------------------------------------------------------------------------------
++multivalue                          --enable-multi-value               --experimental-wasm-mv
++tail-call                           --enable-tail-call                 --experimental-wasm-return-call
++bulk-memory                         --enable-bulk-memory               --experimental-wasm-bulk-memory
++nontrapping-fptoint                 --enable-saturating-float-to-int   --experimental-wasm-sat-f2i-conversions
++sign-ext                            --enable-sign-extension            --experimental-wasm-se
++simd128, +unimplemented-simd128     --enable-simd                      --experimental-wasm-simd
+```
+
+```sh
+# List clang options:
+llc -march=wasm32 -mattr=help
+
+# List Chromium options:
+chromium-browser --single-process --js-flags="--help" 2>&1 | grep wasm
+```
+