Merge pull request 'Start writing documentation on how to use PieFed' (#141) from somoso/pyfedi:add-docs into main

Reviewed-on: https://codeberg.org/rimu/pyfedi/pulls/141

docs/ADDING_COMMUNITIES.md

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+# Adding communities
+
+To add a community to your local 
+
+## Notes
+
+This is only for local communities, not for remote communities.
+
+## Instructions
+
+1. Login to your instance as your admin user
+2. Click the PieFed logo
+3. Click **Explore communities**
+4. In the top right hand corner, click the **Create local** button
+5. Fill in the details

docs/ADDING_USERS.md

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+# Adding users
+
+There are two ways of adding users to your instance to get the ball rolling.
+
+## Notes before starting
+
+Please note that both of these involve **local** users, and not **remote** users.
+
+## Instructions
+
+### Allow registration
+
+To allow registration:
+
+1. Login to your instance as your admin user
+2. Go to **Admin**
+3. Click on **Misc settings**
+4. Look for **Registration mode**. 
+5. Either set the choice to **Open** or **Require Application** 
+
+### Registering
+
+After registration is set to open/require application, the common user flow is to 
+navigate to your instance and click **Register**.
+
+### Disabling ReCAPCHA
+
+If you ensure your `.env` file has empty values for `RECAPTCHA3_PUBLIC_KEY` and 
+`RECAPTCHA3_PRIVATE_KEY`, then you can bypass the ReCAPCHA step. The only problem is
+you will need to ensure the users email address is verified, and this may be a hassle.
+
+## Admin screen
+
+1. Login to your instance as your admin user
+2. Go to **Admin**
+3. Click **Users**
+4. Click the **Add local user** button. 
+5. Fill in the details 
+6. Ensure you click **Email address is verified**. 
+
+Once you've set all the details and save, the user is now accessible.

docs/KEY_TERMS.md

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+# Key terms
+
+* `Instance`: A single PieFed server. if you are developing on your local, it will most 
+likely be http://127.0.0.1:5000. Otherwise, if you have set up your instance, or for
+whichever instance you want to apply (assuming you have the privileges for the 
+actions detailed)
+* `Local`: By making changes on a local instance, any actions done will be done 
+* on that instance.
+* `Remote`: By making changes on a local instance, any actions done will be applied
+to an external instance.