Adding basic install instructions

[hayesla]

fixes #399

Basically, this is just as several people asked my at a summer school how to install as it wasnt on the webpage and didnt read the sunpy docs properly

Summary by Sourcery

Documentation:

• Document basic installation steps in the installation guide.

[sourcery-ai]

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[sourcery-ai]

Hey - I've found 2 issues

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="docs/installation.rst" line_range="7" />
<code_context>

-The easiest way to install aiapy to follow the instructions on :ref:`sunpy-tutorial-installing`.
-The only difference is that you will need to install aiapy instead of sunpy.
+The easiest way to install aiapy to follow the instructions on :ref:`sunpy-tutorial-installing`. The only difference is that you will need to install aiapy instead of sunpy. 
+
+If you are not using mini-conda:
</code_context>
<issue_to_address>
**issue (typo):** Add the missing verb "is" in the introductory sentence.

The sentence currently reads "The easiest way to install aiapy to follow the instructions...". To be grammatically correct, it should read "The easiest way to install aiapy is to follow the instructions...".

```suggestion
The easiest way to install aiapy is to follow the instructions on :ref:`sunpy-tutorial-installing`. The only difference is that you will need to install aiapy instead of sunpy. 
```
</issue_to_address>

### Comment 2
<location path="docs/installation.rst" line_range="9" />
<code_context>
-The only difference is that you will need to install aiapy instead of sunpy.
+The easiest way to install aiapy to follow the instructions on :ref:`sunpy-tutorial-installing`. The only difference is that you will need to install aiapy instead of sunpy. 
+
+If you are not using mini-conda:
+
+.. code-block:: bash
</code_context>
<issue_to_address>
**issue (typo):** Correct the product name "mini-conda" to "Miniconda".

Use the official spelling and capitalization (“Miniconda”) to match Conda’s documentation and avoid confusion.

```suggestion
If you are not using Miniconda:
```
</issue_to_address>

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[nabobalis]

Thanks again @hayesla