Updated content on the JerryScript GitHub Pages site

- API refenrece is updated.
- API examples are updated.
- How To page renamed to Getting Started.
- Fixes in Internlas.

JerryScript-DCO-1.0-Signed-off-by: István Kádár ikadar@inf.u-szeged.hu

01.GETTING-STARTED.md

@@ -0,0 +1,76 @@
+---
+layout: page
+title: Getting Started
+permalink: /getting-started/
+---
+
+* toc
+{:toc}
+
+### Setting Up Prerequisites
+
+Currently, only Ubuntu 14.04+ is officially supported as primary development environment.
+
+There are several dependencies, that should be installed manually. The following list is required for building:
+
+- `gcc` higher than `4.8.2`
+  - native
+  - arm-none-eabi
+- `cmake` higher than `2.8.12.2`
+- `make` higher than `3.81`
+- `bash` higher than `4.3.11`
+- `cppcheck` higher than 1.61
+- `vera++` higher than 1.2.1
+
+```bash
+sudo apt-get install gcc g++ gcc-arm-none-eabi cmake cppcheck vera++
+```
+
+To make our scripts run correctly, several shell utilities should be available on the system:
+
+- `find`
+- `bc`
+- `awk`
+- `sed`
+- `sha256sum`
+- `wget`
+
+Upon first build, `make` would try to setup prerequisites, required for further development and pre-commit testing:
+
+- STM32F3 and STM32F4 libraries
+
+```bash
+make prerequisites -j
+```
+
+It may take time, so go grab some coffee:
+
+```bash
+Setting up prerequisites... (log file: ./build/prerequisites/prerequisites.log)
+```
+
+### Building Debug Version
+
+To build debug version for Linux:
+
+```bash
+make debug.linux -j
+```
+
+To build debug version for Linux without LTO (Link Time Optimization):
+
+```bash
+LTO=OFF make debug.linux -j
+```
+
+### Checking Patch
+
+```bash
+make precommit -j
+```
+
+If some style guidelines, build or test runs fail during precommit, then this is indicated with a message like this:
+
+```
+Build failed. See ./build/bin/unittests/make.log for details.
+```