Add base ranger help file

help/ranger.md

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+## Ranger
+
+### Movement Keys
+
+- Scroll down: `j`
+- Scroll up: `k`
+- Go back one directory: `h`
+- Go forward one directory *or* open the selected file: `l`
+- Move to the top of the file list: `gg`
+- Move to the bottom of the file list: `G`
+- Go to the Nth file: `<N>gg`
+- Go to the home directory: `gh`
+- Go to the root directory: `gr`
+- Quit ranger: `q`
+
+### Useful Things
+
+- Search for files in the current directory: `/`
+- Quickly find and automatically open files that match the pattern: `f`
+- Manually choose software to open the selected file with: `r`
+- Edit the selected file in your editor of choice: `E`
+- Switch back to the terminal and cd to the current directory: `S`
+- Toggle hidden files: `zh`
+
+### Other Commands
+
+- Enter command mode: `:`
+- Change how files are sorted: `o`
+    - Sort by size: `s`
+    - Sort by file type: `t`
+    - Sort by last modified: `m`
+    - Sort by date created: `c`
+    - Sort by time accessed: `a`
+    - Sort alphabetically (default): `b`
+    - Reverse the results: `r`
+    - Randomize the results: `z`
+- Rename the selected file: `:r <newname>`
+- Edit an existing filename: `A`
+
+### Other notes
+
+- You should never use ranger to manipulate files. Ranger does one thing and does it well: explore files.
+- You should not use tabs in ranger. What you would do with tabs can be accomplished easier with the terminal.
+- Although bookmarks are a feature in ranger, your file management should be simple enough that bookmarks aren't required.
+