DOCS: Updating the details install instruction on how to use optional…

… install dependencies

setup/README.md

@@ -2,30 +2,48 @@
 
 0. We recommend installaition within a conda environement. If you don't have one yet, create one using
    ```
-   conda create -n robohive python=3
+   conda create -n robohive python=3.8
    conda activate robohive
    ```
 
-1. Robohive can be installed directly from the [PiPy](https://pypi.org/project/robohive/) using
-   ```
+1. Robohive can be installed directly from the [PyPi](https://pypi.org/project/robohive/). Additional flags can be supplied to use additional  features
+   ``` bash
+   # only mujoco_py as available sim_backend
    pip install robohive
+   # mujoco_py+mujoco as available sim_backend
+   pip install robohive[mujoco]
+   # mujoco_py+mujoco+visual encoders
+   pip install robohive[mujoco, encoders]
    ```
+   RoboHive will throw informative errors if any of these packages are invokes but not installed
 
-2. For editable installation, clone this repo on branch `branch_name` with pre-populated submodule dependencies as -
+2. For editable installation, clone this repo (on a [tag](https://github.com/vikashplus/robohive/releases)) with pre-populated submodule dependencies as -
    ```
-   git clone --branch <branch_name> --recursive https://github.com/vikashplus/robohive.git
+   git clone --branch <tag_name/branch_name> --recursive https://github.com/vikashplus/robohive.git
    ```
    Note: RoboHive agressively uses [git-submodules](https://git-scm.com/book/en/v2/Git-Tools-Submodules). Therefore, it is important to use the exact command above for installation. Basic understanding of how to work with submodules is expected.
 
-   ```
+   ```bash
    $ cd robohive
-   $ pip install -e .[a0] #with a0 binding for realworld robot
-   $ pip install -e .     #simulation only
+   # only mujoco_py as available sim_backend
+   $ pip install -e .
+   # mujoco_py+mujoco as available sim_backend
+   $ pip install -e ".[mujoco]"
+   # mujoco_py+mujoco+visual encoders
+   pip install robohive[mujoco, encoders]
+   # with a0 binding for realworld robot
+   $ pip install -e ".[a0]"
    ```
    **OR** Add repo to pythonpath by updating `~/.bashrc` or `~/.bash_profile`
    ```
    export PYTHONPATH="<path/to/robohive>:$PYTHONPATH"
    ```
+   To use `R3M`, `RRL`, `VC` as visual encoders. Open [setup.py](/setup.py), uncomment the `r3m` and `vc_models` dependency under `encoder` and then run
+   ```
+   # all visual encoders
+   pip install robohive[encoders]
+   ```
+
 3. You can visualize the environments with random controls using the below command
    ```
    $ python robohive/utils/examine_env.py -e FrankaReachRandom-v0