Add Installation, assets directory

- with screenshot of where to fork a repo

Installation.md

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+# Local Installation
+
+The repository can be found on GitHub. [https://github.com/Human-Connection/Human-Connection](https://github.com/Human-Connection/Human-Connection)
+
+{% hint style="info" %}
+TODO: Create documentation section for How to Start and Beginners.
+{% endhint %}
+
+Here are some general informations about our [GitHub Standard Fork & Pull Request Workflow](https://gist.github.com/Chaser324/ce0505fbed06b947d962).
+
+### Fork the Repository
+
+Click on the fork button.
+
+![Fork screenshot](./assets/screenshot-forking-nitro.png)
+
+### Clone your new Repository
+
+Set the current working folder to the path in which the repository should be cloned \(copied\).
+
+```bash
+$ cd PATH-FOR-REPO
+```
+
+For cloning your new repository to your local machine modify the following command to add your GitHub user name.
+
+{% tabs %}
+{% tab title="HTTPS" %}
+
+```bash
+$ git clone https://github.com/YOUR-GITHUB-USERNAME/Human-Connection.git
+```
+
+{% endtab %}
+
+{% tab title="SSH" %}
+
+```bash
+$ git clone git@github.com:YOUR-GITHUB-USERNAME/Human-Connection.git
+```
+
+{% endtab %}
+{% endtabs %}
+
+Change into the new folder.
+
+```bash
+$ cd Human-Connection
+```
+
+Add the original Human Connection repository as `upstream`. This prepares you to synchronize your local clone with a simple pull command in the future.
+
+{% tabs %}
+{% tab title="HTTPS" %}
+
+```bash
+$ git remote add upstream https://github.com/Human-Connection/Human-Connection.git
+```
+
+{% endtab %}
+
+{% tab title="SSH" %}
+
+```bash
+$ git remote add upstream git@github.com:Human-Connection/Human-Connection.git
+```
+
+{% endtab %}
+{% endtabs %}
+
+### Install the dependencies
+
+```bash
+$ yarn
+$ cd backend && yarn
+$ cd ../
+$ cd webapp && yarn
+```
+
+### Copy Environment Variables
+
+```bash
+$ cd ../
+$ cd backend
+$ cp .env.template .env
+```
+
+Configure the file `.env` according to your needs and your local setup.