Include Playground link in Node Template README

Added button and text to point reader to it Playground.

Add Fedora/RHEL/CentOS Installation details

* Patch Multiaddress Into Substrate Node Template

* Updated all version to 100

* Update runtime/src/lib.rs

* Update runtime/src/lib.rs

Co-authored-by: Jimmy Chu <jimmychu0807@gmail.com>

* Add Rust setup steps

* Update to v2.0.1

* Cannot skip Wasm build

* Update docs

* Update build.rs

* new wasm builder, cargo update, and script tweaks

* minor update

Co-authored-by: Dan Shields <35669742+NukeManDan@users.noreply.github.com>
Co-authored-by: Dan Shields <nukemandan@protonmail.com>
Co-authored-by: Jimmy Chu <jimmychu0807@gmail.com>

* Add .editorconfig and format code style

* Enforce line length to be smaller than 100

* Update Local Development docs to use Makefile

* Update Makefile per @athei

Co-authored-by: Alexander Theißen <alex.theissen@me.com>

Co-authored-by: Alexander Theißen <alex.theissen@me.com>

Update init.sh to reflect working nightly

The instruction on readme explicitly depends on nightly-2020-10-05

* nix shell config

* fix darwin

* update nightly for nix shell

Bump wasm-builder-runner

1.0 wasm-builder-runner is not compatible with 2.0 wasm-builder https://github.com/paritytech/substrate/pull/7283#issuecomment-705824314

Architecture specific toolchains are not allowed in this file.
We can assume that stable is the default toolchain and should not
dictate with which toolchain the user builds the client. Also this
breaks under macOS.

We are only interested with which toolchain the runtime is build.
For this we should set the WASM_BUILD_TOOLCHAIN variable.

Closes #95

* Add toolchain file

* Remove reference to script that uses latest nightly

* Remove link to nonexistent subheading